33 05 07.13 - Utility Directional Drilling.pdf

33 05 07.13 - UTILITY DIRECTIONAL DRILLING

Herbert, Rowland & Grubic, Inc. 33 05 07.13 - 1 011361.0461

SECTION 33 05 07.13 - UTILITY DIRECTIONAL DRILLING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Excavation for approach trenches and pits.

2. Horizontal directional drilling.

3. Pipe.

4. Drilling fluid system.

B. Related Requirements:

1. Section 03 60 00 - Grouting: Filling of abandoned boreholes.

2. Section 31 23 16.13 - Trenching: Trenching as required by this Section.

3. Section 33 05 05.31 - Hydrostatic Testing: Sanitary sewer pipe testing.

1.2 REFERENCE STANDARDS

A. American Association of State Highway and Transportation Officials:

1. AASHTO T 180 - Standard Method of Test for Moisture-Density Relations of Soils

Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop.

B. American Water Works Association:

1. AWWA C901 - Polyethylene (PE) Pressure Pipe and Tubing, 1/2 In. (13 mm)

Through 3 In. (76 mm), for Water Service.

2. AWWA C906 - Polyethylene (PE) Pressure Pipe and Fittings, 4 In. (100 mm)

Through 63 In. (1,600 mm), for Water Distribution and Transmission.

C. ASTM International:

1. ASTM D698 - Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort 12 400 ft-lbf/ft3 (600 kN-m/m3).

2. ASTM D1557 - Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort 56,000 ft-lbf/ft3 (2,700 kN-m/m3).

3. ASTM D1784 - Standard Specification for Rigid Poly(Vinyl Chloride) (PVC)

Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds.

4. ASTM D1785 - Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120.

5. ASTM D2239 - Standard Specification for Polyethylene (PE) Plastic Pipe (SIDR-PR)

Based on Controlled Inside Diameter.

6. ASTM D2467 - Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe

Fittings, Schedule 80.

7. ASTM D2683 - Standard Specification for Socket-Type Polyethylene Fittings for

Outside Diameter-Controlled Polyethylene Pipe and Tubing.

8. ASTM D2837 - Standard Test Method for Obtaining Hydrostatic Design Basis for

Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products.

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9. ASTM D2855 - Standard Practice for the Two-Step (Primer and Solvent Cement) Method of Joining Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Pipe and Piping Components with Tapered Sockets.

10. ASTM D3035 - Standard Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Controlled Outside Diameter.

11. ASTM D3261 - Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing.

12. ASTM D3350 - Standard Specification for Polyethylene Plastics Pipe and Fittings Materials.

13. ASTM D6938 - Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth).

14. ASTM F714 - Standard Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Outside Diameter.

15. ASTM F1056 - Standard Specification for Socket Fusion Tools for Use in Socket Fusion Joining Polyethylene Pipe or Tubing and Fittings.

16. ASTM F1962 - Standard Guide for Use of Maxi-Horizontal Directional Drilling for Placement of Polyethylene Pipe or Conduit under Obstacles, Including River Crossings.

D. North American Society for Trenchless Technology:

1. NASTT - Horizontal Directional Drilling Good Practices Guidelines.

E. Plastics Pipe Institute:

1. PPI TR-46 - Guidelines for Use of Mini-Horizontal Directional Drilling for

Placement of High Density Polyethylene Pipe.

1.3 SUBMITTALS

A. Section 01 33 00 - Submittal Procedures: Requirements for submittals.

B. Product Data:

1. Identify source of water used for drilling.

2. Submit copy of approvals and permits for use of water source.

C. Shop Drawings:

1. Submit technical data for equipment, method of installation, and proposed sequence of construction.

2. Include information pertaining to pits, dewatering, method of spoils removal, and equipment size, capacity, and capabilities, including installing pipe on radius, type of drill bit, drilling fluid, method of monitoring line and grade, detection of surface movement, name plate data for drilling equipment, and mobile spoils removal unit.

D. Manufacturer's Certificate: Certify that products meet or exceed specified requirements.

E. Field Quality-Control Submittals: Indicate results of Contractor-furnished tests and inspections.

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F. Qualifications Statement:

1. Submit qualifications for driller.

1.4 CLOSEOUT SUBMITTALS

A. Section 01 77 00 - Closeout Procedures: Requirements for submittals.

B. Project Record Documents: Record actual locations of pipe and invert elevations.

C. Identify and describe unexpected variations to subsoil conditions or discovery of uncharted utilities.

D. Record actual depth of pipe at 25-foot intervals.

E. Record actual horizontal location of installed pipe.

F. Show depth and location of abandoned bores.

G. Record depth and location of drill bits and drill stems not removed from bore.

1.5 QUALITY ASSURANCE

A. Perform Work according to following:

1. NASST - Horizontal Directional Drilling Good Practices Guidelines.

2. ASTM F1962.

3. PPI TR-46.

1.6 QUALIFICATIONS

A. Driller: Company specializing in performing Work of this Section with minimum three years' documented experience.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Section 01 61 00 - Product Requirements: Requirements for transporting, handling, storing, and protecting products.

B. Inspection: Accept materials on Site in manufacturer's original packaging and inspect for damage.

C. Handling:

1. Use shipping braces between layers of stacked pipe.

2. Support pipes with nylon slings during handling.

D. Storage:

1. According to manufacturer instructions.

2. Stack piping lengths no more than three layers high.

3. Store field joint materials in original shipping containers in dry area indoors.

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E. Protection:

1. Protect materials from moisture and dust by storing in clean, dry location remote from construction operations areas.

2. Protect pipe from entry of foreign materials and water by installing temporary covers, completing sections of Work, and isolating parts of completed system.

3. Provide additional protection according to manufacturer instructions.

1.8 AMBIENT CONDITIONS

A. Section 01 50 00 - Temporary Facilities and Controls: Requirements for ambient condition control facilities for product storage and installation.

B. Maintain storage temperature of 60 to 85 degrees F.

1.9 EXISTING CONDITIONS

A. Field Measurements:

1. Verify field measurements prior to fabrication.

2. Indicate field measurements on Shop Drawings.

PART 2 - PRODUCTS

2.1 HORIZONTAL DIRECTIONAL DRILLING

A. Performance and Design Criteria:

1. Drilling Steering System: Remote with continuous electronic monitoring of boring depth and location.

2. Directional Change Capability:

a. Pipe Size 1 to 4 Inches: 90 degrees with 35-foot radius curve.

b. Pipe Size 6 Inches: 90 degrees with a 56-foot radius curve.

3. Minimum distance for single bores and between boring pits:

a. Pipe Size 1 to 1-1/2 Inches: 400 feet.

b. Pipe Size 2 to 2-1/2 Inches: 350 feet.

c. Pipe Size 3 to 6 Inches: 300 feet.

4. Ratio of Reaming Diameter to Pipe OD:

a. Nominal Pipe Diameter of 6 Inches and Smaller: Maximum of 1.5.

b. Nominal Pipe Diameter Larger Than 6 Inches: Submit recommended ratio and reaming procedures for review by Engineer.

B. Water Source:

1. Potable.

2. Obtained from utility source.

C. Materials:

1. Drilling Fluid: Liquid bentonite clay slurry; totally inert with no environmental risk.

D. Piping: As specified in 33 31 26 – Sanitary Pressure Sewer Piping.

Herbert, Rowland & Grubic, Inc. 33 05 07.13 - 5 011361.0461

2.2 MIXES

A. Grout: As specified in Section 03 60 00 - Grouting.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Section 01 73 00 - Execution Requirements: Requirements for installation examination.

B. Verify that connection sizes, locations, and invert elevations are according to Drawings.

3.2 PREPARATION

A. Section 01 73 00 - Execution Requirements: Requirements for installation preparation.

B. Call Pennsylvania One Call System, Inc. at 1-800-242-1776 not less than three working days before performing Work:

1. Request underground utilities to be located and marked within and surrounding construction areas.

C. Locate and identify utilities indicated to remain and protect from damage.

D. Identify required lines, levels, contours, and data locations.

E. Protect plant life, lawns, and other features remaining as portion of final landscaping.

F. Protect benchmarks and survey control points from excavating equipment and vehicular traffic.

G. Establish pipe elevations with not less than the minimum cover identified on the Drawings.

3.3 INSTALLATION

A. Dewatering:

1. Intercept and divert surface drainage, precipitation, and ground water away from excavation using dikes, curb walls, ditches, pipes, sumps, or other approved means.

2. Develop and maintain substantially dry subgrade during drilling and pipe installation.

3. Comply with State of Pennsylvania requirements for discharging water to watercourse, preventing stream degradation, and controlling erosion and sediment.

B. Excavation:

1. Excavate subsoil as specified in Section 31 23 16.13 - Trenching.

2. Excavate approach trenches and pits as Site conditions require; minimize number of access pits.

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3. Provide sump areas to contain drilling fluids.

4. Install excavation supports as specified in Section 31 23 16.13 – Trenching.

5. Restore areas after completion of drilling and carrier pipe installation.

C. Drilling:

1. Drill pilot bore with vertical and horizontal alignment as indicated on Drawings.

2. Surveying:

a. Survey entire drill path and mark entry and exit locations with stakes.

b. If a magnetic guidance system is used, survey drill path for surface geomagnetic variations or anomalies.

3. Guiding:

a. Guide drill remotely from ground surface to maintain alignment by monitoring signals transmitted from drill bit.

b. Monitor depth, pitch, and position.

c. Adjust drill head orientation to maintain correct alignment.

4. Drilling Fluid:

a. Inject drilling fluid into bore to stabilize hole, remove cuttings, and lubricate drill bit and pipe.

b. Continuously monitor drilling fluid pumping rate, pressure, viscosity, and density while drilling pilot bore, back reaming, and installing pipe to ensure adequate removal of soil cuttings and stabilization of bore.

c. Provide relief holes when required to relieve excess pressure.

d. Minimize heaving during pullback.

5. Verification of Accuracy:

a. Calibrate and verify electronic monitor accuracy during first 50 feet of bore in presence of Engineer before proceeding with other drilling.

b. If required accuracy is not met, adjust equipment or provide new equipment capable of meeting required accuracy.

6. After completing pilot bore, remove drill bit.

D. Drilling Obstructions:

1. If obstructions are encountered during drilling, notify Engineer immediately.

2. Do not proceed around obstruction without approval of Engineer.

3. For conditions requiring more than 3 feet of deviation in horizontal alignment, submit revised Drawings showing proposed alignment to Engineer for approval before resuming Work.

4. Maintain adjusted bore alignment within easement or right-of-way.

E. Piping:

1. Install reamer and pipe pulling head; select reamer with minimum bore diameter required for pipe installation.

2. Attach pipe to pipe pulling head and pull reamer and pipe to entry pit along pilot bore.

3. Inject drilling fluid through reamer to stabilize bore and lubricate pipe.

4. Install piping with horizontal and vertical alignment as shown on Drawings.

5. Protect and support pipe being pulled into bore such that pipe moves freely and is not damaged during installation.

6. Do not exceed pipe manufacturer's recommended pullback forces.

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7. Trace Wire:

a. Install trace wire continuous with each bore.

b. Splice trace wire only at intermediate bore pits.

c. Tape insulated trace wire to maintain integrity of pipe detection.

d. Terminate trace wire for each pipe run at structures along pipe system.

e. Provide extra length of trace wire at each structure such that trace wire can be pulled 3 feet out top of structure for connection to detection equipment.

f. Test trace wire for continuity for each bore before acceptance.

8. Provide sufficient length of pipe to extend past termination point to allow connection to other pipe sections.

9. Allow minimum of 24 hours for stabilization after installing pipe before making connections to pipe.

10. Mark location and depth of bore with spray paint on paved surfaces and on wooden stakes on non-paved surfaces at 25-foot intervals.

F. Slurry Removal and Disposal:

1. Contain excess drilling fluids at entry and exit points until recycled or removed from Site; provide recovery system to remove drilling spoils from access pits.

2. Drilling Spoils:

a. Remove, transport, and legally dispose of drilling spoils.

b. Do not discharge drilling spoils in sanitary sewers, storm sewers, or other drainage systems.

c. When drilling in suspected contaminated soil, test drilling fluid for contamination before disposal.

3. If drilling fluid leaks to surface, immediately contain leak and barricade area from vehicular and pedestrian travel before resuming drilling operations.

4. Complete cleanup of drilling fluid at end of each working day.

G. Backfilling:

1. Install backfill as specified in Section 31 23 16.13 – Trenching.

2. Backfill approach trenches and pits with subsoil fill to contours and elevations of surrounding existing grade.

3. Compact subsoil fill as specified in Section 31 23 16.13 – Trenching to minimum

100 percent of maximum density.

3.4 TOLERANCES

A. Section 01 40 00 - Quality Requirements: Requirements for tolerances.

B. Maximum Variation from Horizontal Position: 12 inches.

C. Maximum Variation from Vertical Elevation: 2 inches.

D. Minimum Horizontal and Vertical Clearance from Other Utilities: 18 inches.

E. Deviation:

1. If pipe installation deviates beyond specified tolerances, abandon bore, remove installed pipe, rebore, and reinstall pipe in correct alignment.

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2. Fill abandoned bores greater than 3 inches in diameter with grout or flowable fill material.

3.5 FIELD QUALITY CONTROL

A. Section 01 40 00 - Quality Requirements: Requirements for inspecting and testing.

B. Upon completion of pipe installation, test pipe according to following:

1. Sanitary Sewer Pipe Testing: As specified in Section 33 05 05.31 - Hydrostatic

Testing.

2. If tests indicate Work does not meet specified requirements, remove Work, replace, and retest.

C. Compaction Testing:

1. Comply with AASHTO T 180.

2. If tests indicate Work does not meet specified requirements, remove Work, replace, and retest.

3. Testing Frequency: One for each lift.

D. Frequency of Compaction Testing: One for each lift.

E. Certify that equipment for drilling has been properly set up and is ready for drilling.

3.6 CLEANING

A. Section 01 73 00 - Execution Requirements: Requirements for cleaning.

B. Upon completion of drilling and pipe installation, remove drilling spoils, debris, and unacceptable material from approach trenches and pits.

C. Clean up excess slurry from ground.

D. Restore approach trenches and pits to original condition.

E. Remove temporary facilities for drilling operations as specified in Section 015000 - Temporary Facilities and Controls.

END OF SECTION