SECTION_33_31_00_Sanitary_Sewerage_Systems.docx
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SECTION 33 31 00 SANITARY SEWERAGE SYSTEMS
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SECTION 33 31 00
SECTION 33 31 00
SANITARY SEWERAGE SYSTEMS
| PART 1 | GENERAL |
| 1.1 | SECTION INCLUDES |
| A. | Gravity sanitary sewerage systems. |
| B. | Pressure systems are indicated in Section 33 11 00. |
| 1.2 | REFERENCES |
| A. | ASTM C 478: Standard Specification for Precast Reinforced Concrete Manhole Section. |
| B. | ASTM C 891: Standard Practice for Installation of Underground Precast Concrete Utility Structures. |
| C. | ASTM C 923: Standard Specification for Resilient Connectors Between Reinforced Concrete Manhole Structures, Pipes and Laterals. |
| 1.3 | PERFORMANCE REQUIREMENTS |
| A. | Vertical Cover: Unless indicated otherwise, 2 feet minimum for laterals and 4 feet when subjected to light construction equipment loads. |
| B. | Remove any section of pipe already placed that is found to be out of alignment tolerance indicated, defective, or damaged. Relay or replace at no additional cost to OWNER. |
| 1.4 | PROJECT CONDITIONS |
| A. | Minimize traffic interruptions. Barricade stockpiles. |
| B. | Provide access to adjacent properties for local traffic and pedestrians, Section 01 31 13. |
| C. | Repair public and private facilities damaged by Contractor. |
| D. | Prior to Backfilling: Commission pipeline per Section 33 08 00. Provide sizes and types of equipment connections and fittings which match pipe materials when pressure testing system. |
| 1.5 | ACCEPTANCE |
| A. | Each sanitary sewer system component must pass applicable requirements in Section 33 08 00. |
| PART 2 | PRODUCTS |
| 2.1 | PIPING AND FITTINGS |
| A. | Provide piping materials and factory fabricated piping products of sizes, types, and classes indicated. |
| B. | Where not indicated, provide proper selection acceptable to COR to comply with installation requirements. |
| C. | Provide pipe fittings and accessories of same material and weight or class as pipe, with joining method indicated or recommended by manufacturer. |
| 2.2 | MORTAR, GROUT AND CONCRETE |
| A. | Mortar: Cement, Section 04 05 16. |
| B. | Grout: Cement, Section 03 61 00. |
| C. | Concrete: |
| 1. | Cast-in-place: Class 4000, Section 03 30 04. |
| 2. | Precast: Class 5000, Section 03 40 00. |
| 2.3 | MANHOLES |
| A. | Basin: Precast concrete, ASTM C 478. |
| B. | Steps: None. |
| C. | Top: Concentric cone. Concentric flat slab concrete deck allowed only with COR's permission. |
| D. | Frame and Cover: Scoriated, asphalt coated, heavy duty, ductile iron; Section 05 56 00 with flat top design meeting load rating H-20 and appropriate utility lettering. Shape, size and lifting device as indicated. |
| E. | Pipe Connectors: Resilient, ASTM C 923. Sand mortar grout pipe connections. |
| F. | Joints in Sections: Bituminous mastic gasket-type sealant unless indicated otherwise. |
| PART 3 | EXECUTION |
| 3.1 | PREPARATION |
| A. | Verify Trench Excavation is ready to receive work, and dimensions, and elevations are as indicated. |
| B. | Hand trim Excavations to required elevations. Backfill over excavations and compact, Section 31 23 26. |
| C. | Examine areas and conditions under which materials and products are to be installed. Do not proceed with system installation until unsatisfactory conditions have been corrected in manner acceptable to system installer. |
| D. | Clearly identify and promptly set aside defective or damaged pipe. |
| E. | Use pipe cutting tool acceptable to pipe manufacturer. |
| 3.2 | INSTALLATION - PIPE AND FITTINGS |
| A. | Place bell or groove end facing upstream. |
| B. | Install gaskets per manufacturer's recommendations. |
| C. | Plug leakproof such pipeline branches, stubs or other open ends which are not to be immediately connected. |
| D. | Clean interior of pipe of dirt and debris as work progresses. |
| E. | Meet line and grade tolerance specified in Section 33 08 00. |
| 3.3 | INSTALLATION - MANHOLES |
| A. | Form bottom of Excavation clean and smooth to correct elevation. |
| B. | Place structures in location indicated. |
| C. | Install precast units, ASTM C 891. |
| D. | Provide elevations and pipe inverts for inlets and outlets indicated. |
| E. | When structures occur in Pavements, mount frame and cover 1/2 inch below finished surface, elsewhere set 3 inches above finished grade. Provide a concrete Cover Collar between the frame and asphalt Pavement. |
| 3.4 | ABANDONED UTILITIES |
| A. | Plug and cap with concrete all open ends of abandoned underground utilities which are to remain in place. |
| B. | Provide closure to withstand hydrostatic or earth pressure which may result after ends of abandoned utilities have been closed. |
| 3.5 | TAP CONNECTIONS - 6 INCHES AND SMALLER |
| A. | Field cutting into new or existing piping will not be permitted unless written permission is obtained from COR. |
| B. | Make connections to existing pipe and underground structures, so connections will conform as nearly as practicable to requirements specified for new work. |
| C. | Use commercially manufactured wyes for branch connections. Spring wyes into existing line and encase entire wye, plus 6 inches overlap, with not less than 6 inches of concrete. |
| D. | For taps into existing 24 inches or larger piping, or to underground structures, cut opening into unit sufficiently large to allow 3 inches of concrete to be packed around entering connection. Cut ends of connection passing through pipe or structure wall to conform to shape of and parallel with inside wall, unless otherwise indicated. Grout connection to provide smooth transition inlet into pipe. |
| 3.6 | TAP CONNECTIONS - LARGER THAN 6 INCHES |
| A. | Not allowed. Provide a Manhole structure. |
| 3.7 | JOINTS |
| A. | Join pipe per manufacturer's recommendation or as indicated. |
| B. | Joining Pipe of Different Sizes: At Manholes only. |
| C. | Use neoprene couplings with stainless steel bands to make connections between dissimilar pipe, or where standard pipeline joints are impractical. |
| 3.8 | BACKFILLING |
| A. | Prior to Backfilling: Commission pipeline, Section 33 08 00. Provide sizes and types of equipment connections and fittings which match pipe materials when pressure testing system. |
| B. | Trenches: Section 33 05 20. |
| C. | Structures or Landscapes: Section 31 23 23. |
| 3.9 | CLEANING |
| A. | Remove debris, concrete, or other extraneous material which accumulates in existing pipes or structures. |
| B. | Clean all pipelines after testing. Do not flush sand, gravel, concrete, debris or other materials into existing piping system. |
| 3.10 | SURFACE RESTORATIONS |
| A. | Provide temporary paved surfaces where Trenches pass through roadways, Driveways, or sidewalks. |
| B. | Restore paved surfaces, Section 33 05 25. |
| C. | Restore affected landscaped surfaces. |
END OF SECTION
SANITARY SEWERAGE SYSTEMS Page 1
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