CONSTRUCTION SPECIFICATION FOR THE INSTALLATION OF ELECTRICAL CHAMBER

Transcription

1 ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 602 MARCH 1993 CONSTRUCTION SPECIFICATION FOR THE INSTALLATION OF ELECTRICAL CHAMBER SCOPE REFERENCES MATERIALS TABLE OF CONTENTS Concrete.02 Reinforcing Steel.03 Precast Concrete Electrical Chambers.04 Maintenance Hole Steps.05 Bricks.06 Precast Adjustment Units.07 Maintenance Hole Frames, Covers and Lift Rings.08 Pulling Irons.09 Drain Pipe Fittings Mortar.11 Handhole Frames and Covers.12 Waterproofing.13 Grounding Materials.14 Granular Material CONSTRUCTION Electrical Maintenance Holes Earth Excavation.02 Dewatering.03 Installation.04 Pulling Irons.05 Waterproofing.06 Duct Entry.07 Grounding.08 Installation of Adjustment Units.09 Frames and Covers.10 Backfill Page 1 Rev. Date: 03/1993 OPSS 602

2 Electrical Handholes Installation.02 Grounding.03 Frames and Covers.04 Backfill Adjusting and Rebuilding Electrical Chambers Adjusting and Rebuilding Electrical Chamber Drains Drainage Facilities QUALITY ASSURANCE MEASUREMENT FOR PAYMENT Actual Measurement Electrical Maintenance Holes Electrical Handholes.02 Adjusting and Rebuilding Electrical Chambers.03 Electrical Chamber Drains Plan Quantity Measurement Electrical Maintenance Holes Electrical Handholes.02 Adjusting and Rebuilding Electrical Chambers.03 Electrical Chamber Drains BASIS OF PAYMENT Electrical Maintenance Holes - Item Electrical Handholes - Item Adjusting and Rebuilding Electrical Chambers - Item Electrical Chamber Drains - Item SCOPE This specification covers the requirements for the installation, adjustment and rebuilding of electrical chambers including electrical maintenance holes, handholes and chamber drains REFERENCES This specification refers to the following standards, specifications or publications: Page 2 Rev. Date: 03/1993 OPSS 602

3 Ontario Provincial Standard Specifications, Construction: OPSS 405 OPSS 407 OPSS 408 OPSS 503 OPSS 516 OPSS 517 OPSS 601 OPSS 603 OPSS 609 OPSS 610 OPSS 904 OPSS 905 Pipe Subdrains Manholes, Catchbasins, Ditch Inlets and Valve Chambers Adjusting or Rebuilding Manholes Catchbasins, Ditch Inlets and Valve Chambers Site Preparation for Pipelines Excavating, Backfilling and Compacting for Manholes, Catchbasins, Ditch Inlets and Valve Chambers Dewatering Electrical Work - General Underground Ducts Grounding Removal of Electrical Equipment Concrete Structures Steel Reinforcement for Concrete Ontario Provincial Standard Specifications, Material: OPSS 1004 OPSS 1010 OPSS 1103 OPSS 1350 OPSS 1351 OPSS 1440 OPSS 1850 Aggregates-Miscellaneous Aggregates, Granular A, B, M and Select Subgrade Material Emulsified Asphalt Concrete (Materials and Production) Components for Precast Reinforced Concrete Catchbasins, Manholes, Ditch Inlets and Valve Chambers Steel Reinforcement for Concrete Frames, Grates, Manhole Covers, and Welded and Rivetted Steel Gratings American Standards for Testing and Materials: ASTM A Grey Iron Castings Canadian General Standards Board: CGSB 41-GP-29Ma Tubing Plastic, Corrugated Drainage Canadian Standard Association: CAN/CSA A82.1-M87 - Burned Clay Brick (Solid Masonry Units made from Clay or Shale) CAN/CSA C83-M87 - Communication and Power Line Hardware CAN3-C22.3 #7-M86 - Underground Systems MATERIALS Concrete Concrete shall conform to OPSS Concrete for cast in place units shall be 30 MPa class Reinforcing Steel Reinforcing steel for cast in place units shall conform to OPSS Page 3 Rev. Date: 03/1993 OPSS 602

4 Precast Concrete Electrical Chambers Precast concrete electrical maintenance holes and handholes shall conform to OPSS Maintenance Hole Steps Maintenance hole steps shall conform to OPSS Bricks Bricks shall be hard burned clay and shall conform to CSA A82.1, Type FBS or equivalent strength concrete suitable for exterior application Precast Adjustment Units Precast adjustment units shall conform to OPSS Maintenance Hole Frames, Covers and Lift Rings Maintenance hole frames, covers and lift rings shall conform to OPSS Pulling Irons Pulling irons for cast in place maintenance holes shall be galvanized wrought steel and shall conform to CSA C83, Item C Pulling irons for precast concrete maintenance holes shall be galvanized steel straight thimble eye bolts, 20 mm diameter, 200 mm length with heavy square nuts and 100 x 100 x 10 mm square washers conforming to CSA C83, items C83.65 and C83.30 No Drain Pipe The 100 mm diameter drain pipe shall be unperforated, corrugated high density polyethylene, conforming to CGSB 41-GP-29Ma. The 150 mm diameter corrugated steel end sections and fittings shall conform to OPSS Fittings Fittings shall be suitable for and compatible with the class and type of pipe with which they will be used. Plugs where used shall be polyethylene. Galvanizing of rodent gates shall conform to CSA G Mortar The mortar shall consist of one part Portland cement conforming to OPSS 1350 and three parts of mortar sand conforming to OPSS 1004 and shall be wetted with sufficient water to make the mixture plastic. Air entrainment shall be 12% Handhole Frames and Covers Cast ferrous alloy frames and covers shall conform to ASTM A48, Class No. 30 C and the contract. Page 4 Rev. Date: 03/1993 OPSS 602

5 Waterproofing Waterproofing material shall be emulsified asphalt, anionic slow-setting type conforming to OPSS Grounding Materials Grounding materials shall conform to OPSS Granular Material Granular material for bedding and backfill shall conform to OPSS CONSTRUCTION Electrical Maintenance Holes The work for electrical maintenance holes, regardless of type or size, shall include installation, frames and covers, pulling irons, waterproofing, duct entry, grounding, dewatering, installation of adjustment units, earth excavation and backfill. The work for rock excavation shall be included under the item "Rock Excavation for Electrical Installation" described in OPSS Earth Excavation Earth shall be excavated to accommodate at least 300 mm of granular backfill around the outer walls of the unit and where required, a drainage pocket or drainage facilities lower than the elevation of the maintenance hole floor using 19 mm clear crushed rock shall be provided. Earth shall be excavated for separate drainage pockets and drain pipes as indicated in the contract Dewatering Dewatering shall conform to OPSS Installation Maintenance holes shall be oriented such that ducts or duct bank entries will have an angle of 90 degrees between maintenance hole wall and the axis of the ducts or duct bank. If this is not possible, the angle shall not be less than 45 degrees. Maintenance holes shall be oriented such that maintenance hole steps are placed on the maintenance hole wall nearest the travelled edge of pavement. All sharp projections and edges of concrete shall be ground smooth prior to installation of wiring baffles or mechanical supports for cables. All liquid and debris shall be cleaned from the units upon completion and prior to the acceptance of work by the Contract Administrator. Where it is required to construct a maintenance hole on existing runs of rigid duct, direct buried, in steel liner or concrete encased, the ducts, concrete encasement, reinforcing steel or steel liner shall be cut back and removed to suit the maintenance hole dimensions. The Contractor may construct a cast-in-place unit around the duct structure and modify the duct after placing the maintenance hole, or cut the duct structure back to a minimum of 300 mm beyond the outer maintenance hole walls, install a precast unit and reinstate ducts into the maintenance hole. Page 5 Rev. Date: 03/1993 OPSS 602

6 Either precast concrete or cast-in-place maintenance holes are acceptable. Precast Maintenance Holes Precast units shall be supplied to the required depth indicated in the contract or to the depths necessary to accommodate the depths of ducts, duct banks or cable required to enter the precast unit. Where the vertical location of ducts are adjusted for utility clearance or drainage and a deeper maintenance hole is required, the additional depth may be obtained by additional courses of brick, or precast concrete adjustment units up to 255 mm depth. Precast units shall be installed on a level surface, backfilled and compacted to maintain the specified unit plumb and true to the required alignment and grades. Any adjustment of the unit for plumb, alignment and grade shall be carried out by lifting the unit free of the excavation, adjusting the bottom surface and replacing the unit to proper alignment and grade. During installation, all duct openings and drainage facilities shall be fitted to the required orientation and location and all segmental sections, gaskets, PVC waterstops shall be firmly seated. Cast-In-Place Maintenance Holes The specified units shall be cast plumb and true to the required alignment and grades. Concrete shall be placed, cured, protected and finished to conform to OPSS 904. Reinforcing steel shall conform to OPSS 905. Formwork for duct openings shall be accurately located to the required dimensions, whether used for ducts in the contract or not, and shall consist of either non-metallic or removable forms. Ducts, duct banks, duct end bells and liners shall be set in the framework prior to pouring concrete and shall be installed to provide an opening for later installation of these items Pulling Irons Pulling irons shall be mounted on all maintenance holewalls opposite to the rigid duct structures and in the floor of the units, and centred under the cover opening where indicated in the contract. Where pulling irons are installed after concrete has been poured, a 22 mm diameter hole shall be drilled in the wall and an eyebolt installed with a square washer and nut on each side of the wall. Pulling irons shall be installed before waterproofing the unit Waterproofing Where indicated in the contract, waterproofing material shall be applied to the outside walls, top, and brick work of maintenance hole units. For precast units, the underside of the floor slab shall have a similar application. For cast-in-place units, 300 µm polyethylene sheeting shall be installed prior to pouring concrete. All holes not used shall be grouted with mortar. Waterproofing material shall be applied at the rate of 0.8 l/m² of surface Duct Entry Duct entry holes shall be provided in the walls of maintenance holes in the orientation and number indicated in the contract. All unused duct entry holes shall be firmly plugged from the inside with plastic plugs, or where waterproofing is required, with mortar mix to the full thickness of the concrete wall. Page 6 Rev. Date: 03/1993 OPSS 602

7 Where concrete encased duct banks are installed in maintenance hole units, the reinforcing steel of the duct bank shall be inserted 75 mm into the maintenance hole wall. The duct bank encasement shall be completely surrounded and bonded to the concrete wall. Where direct buried rigid ducts, rigid ducts by subsurface installation or steel liners are installed in maintenance hole units, they shall be completely surrounded with concrete or grouted in place with mortar mix to the full thickness of the maintenance hole wall Grounding Metal cable racks and maintenance hole frames shall be connected to the system ground wire. Where a ground rod is required at a maintenance hole, the system ground wire shall exit and re-enter the maintenance hole to enable ground rod connection as indicated in the contract. All grounding shall conform to OPSS Installation of Adjustment Units The installation of bricks or precast concrete adjustment units shall conform to OPSS Frames and Covers Maintenance hole frames shall be installed on at least one course and a maximum of three courses of brick or on a maximum height of 255 mm of precast concrete adjustment units. Bricks and adjustment units shall be installed with 10 mm layers of mortar mix. All surfaces shall be coated with a mortar mix 6 mm thick. Frames shall be set in mortar mix and adjusted to the required elevation and crossfall. Maintenance hole covers and gaskets shall be secured as indicated in the contract Backfill Backfill around the walls of units shall conform to OPSS 516 except that acceptable native material may be used where the electrical chamber is 1.5 m or more beyond the outside edge of shoulder. Granular backfill or unshrinkable backfill, or material approved by the Contract Administrator shall be used for chambers within 1.5 m of the outside edge of shoulder Electrical Handholes The work for electrical handholes, regardless of type or size, shall include installation, frames and covers, duct entry, backfill, grounding, and the work described in subsection for waterproofing, dewatering, removals, and earth excavation. The work for rock excavation is included under the item "Rock Excavation for Electrical Installation" described in OPSS Installation The Contractor may choose either precast or cast-in-place concrete handholes. Handholes of materials other than concrete shall be prefabricated units only. Precast Concrete Handholes The precast unit shall be installed plumb, true to alignment and grade, and firmly bedded on the drainage pocket backfill. Page 7 Rev. Date: 03/1993 OPSS 602

8 During installation, the duct entry holes shall be oriented in the required direction. The enlarging of duct entry holes is prohibited. Cast-In-Place Concrete Handholes Formwork shall be secured to form a concrete envelope of uniform wall thickness and shall be set plumb and firmly bedded on the drainage pocket backfill. The cast iron frame and all ducts shall be installed in the formwork prior to pouring concrete. Concrete shall be poured, cured, protected and finished conforming to OPSS 904. The outside formwork shall be removed to at least 150 mm below finished grade Grounding Handhole frames or covers shall be connected to the system ground wire when low voltage cables are in the handhole. Where frames are not present, 1.5 m of #6 AWG ground wire shall be connected between the system ground wire and the metallic cover and at least 1.5 m of wire shall be left loose for cover removal. All grounding shall conform to OPSS Frames and Covers For handholes using frames and covers similar to those used for maintenance holes, the setting and adjustment of the frames and covers shall conform to subsection Cast iron frames for handhole covers shall be adjusted to the required elevation and crossfall. Mortar mix shall be used to smooth out any edges protruding above the concrete envelope. Cast iron covers for handholes shall be secured as indicated in the contract. Covers for prefabricated units shall be firmly seated conforming to the manufacturer's instructions Backfill Backfill for units installed within roadbeds or in sidewalks shall be carried out with granular material as described in subsection Backfill for units installed in grassed areas shall be native backfill placed and compacted conforming to OPSS Adjusting and Rebuilding Electrical Chambers The work for adjusting and rebuilding electrical chambers, regardless of type, size, depth or method of installation, shall include adjusting and rebuilding and the work described in subsection for frames and covers, waterproofing, duct entry, grounding, dewatering, removals, earth excavation and backfill Adjusting and Rebuilding The adjusting and rebuilding of existing electrical chambers required to accommodate changes in elevation shall conform to OPSS Electrical Chamber Drains The work for electrical chamber drains, regardless of length, shall include drainage facilities. Page 8 Rev. Date: 03/1993 OPSS 602

9 Drainage Facilities Drainage facilities shall consist of a 100 mm diameter corrugated, high density polyethylene drain pipe with ABS pipe fittings and a ball-float type backwater valve. The drain pipe shall connect to a drainage pocket, an embankment slope, a ditch, a storm sewer maintenance hole, a catchbasin inlet, a concrete storm sewer pipe or a concrete culvert, as indicated in the contract. Holes in such structures shall be formed by core drilling or alternative methods. The ends of cut steel bars shall be coated with epoxy paste and the drain pipe shall be mortared in place so as not to protrude into the structure cavity. The drain pipe shall have a formed trap in all cases where drainage to a storm sewer system component is required. The drain pipe shall be provided with a 150 mm diameter corrugated steel end section and rodent gate in all cases where drainage to an embankment slope or ditch is required. The drain pipe shall be inserted at least 300 mm into the end section. Site preparation for this work shall conform to OPSS 503 where the work extends beyond the limits of general grading operations. Drain pipes shall be laid in a trench between 300 and 400 mm wide, with a minimum grade of 400: mm of sand bedding and 150 mm of sand backfill shall be installed where rock excavation is required. The work for rock excavation is included under the item "Rock Excavation for Electrical Installation" described in OPSS 603. Native backfill and granular backfill shall be placed and compacted conforming to OPSS QUALITY ASSURANCE Concrete will be tested in conformance to OPSS 904. Tests required for compaction will conform to OPSS MEASUREMENT FOR PAYMENT Actual Measurement Electrical Maintenance Holes Electrical Handholes The unit of measurement is each Adjusting and Rebuilding Electrical Chambers Measurement will be based on the "height" in metres conforming to OPSS Electrical Chamber Drains Measurement will be made horizontally in metres, along the centreline of the drain pipe, from the centre of electrical chambers to the centre of drainage pockets, storm sewer structures, storm sewer pipes, and concrete culverts or to the ends of drains terminating in an embankment slope or ditch. Page 9 Rev. Date: 03/1993 OPSS 602

10 Plan Quantity Measurement Electrical Maintenance Holes Electrical Handholes Measurement is by Plan Quantity as may be revised by Adjusted Plan Quantity. The unit of measurement is each Adjusting and Rebuilding Electrical Chambers Measurement is by Plan Quantity as may be revised by Adjusted Plan Quantity in conformance to OPSS Electrical Chamber Drains Measurement is by Plan Quantity as may be revised by Adjusted Plan Quantity, of the horizontal distance in metres, along the centreline of the drain pipe, from the centre of electrical chambers to the centre of drainage pockets, storm sewer structures, storm sewer pipes, and concrete culverts or to the ends of drains terminating in an embankment slope or ditch BASIS OF PAYMENT Electrical Maintenance Holes - Item Electrical Handholes - Item Adjusting and Rebuilding Electrical Chambers - Item Electrical Chamber Drains - Item Payment at the contract price for the above item(s) shall be full compensation for all labour, equipment and material required to do the work. Page 10 Rev. Date: 03/1993 OPSS 602