SECTION HORIZONTAL DIRECTIONAL DRILLING

Transcription

1 SECTION HORIZONTAL DIRECTIONAL DRILLING PART 1 - GENERAL 1.1 DESCRIPTION A. Furnish all labor, materials, tools, and equipment required to install pipes below the outer perimeter prison fence using the directional drilling method to the sizes and limits as shown on the plans, and as specified by these technical specifications herein. Work includes, but is not limited to, proper installation, restoration of underground utilities, and environmental protection and restoration. 1.2 QUALITY ASSURANCE A. Experience: Actively engaged in horizontal directional drilling for minimum of 5 years. B. Perform the work in conformance with ASTM Fl962, current revision, "Standard Guide for Use of Maxi-Horizontal Direction Drilling for Placement of Polyethylene Pipe or Conduit Under Obstacles, Including River Crossings." 1.3 SUBMITTALS A. Previous Experience. 1. Presentation of similar experience in the last 3 years. B. Pipe material catalog cut sheets 1.4 PROJECT CONDITIONS A. Complete horizontal directional drilling so as not to interfere with, interrupt, or endanger surface and activity thereon. B. All horizontal directional drilling activities shall be coordinated with the Owner. Notify Owner at least five working days prior to the intended start date of work on site. C. Contractor is responsible for determining and physically locating the depth, location, and size of all existing underground facilities in the vicinity of the proposed horizontal directional bore. The kinds, locations, and sizes of the existing underground facilities which may be shown on the Drawings are intended only as a guide to the Contractor and are not guaranteed to be even approximately correct. D. Comply with applicable ordinances, codes, statutes, rules, and regulations of State of Missouri, MSHA, applicable County building codes, and applicable regulations of Federal Government, OSHA 29CFR 1926, and applicable criteria of ANSI A (R2001), "Safety Requirements for Tunnels, Shafts, and Caissons." PART 2 -PRODUCTS 2.1 MATERIALS A. Directional Drilling Equipment HORIZONTAL DIRECTIONAL DRILLING C1408-0l

2 B. Pipe 1. All equipment for the horizontal directional bore shall have the capacity, stability, and necessary safety features to fully comply with the specifications and requirements of this section without showing evidence of undue stress or failure. 1. Fusible polyvinylchloride pipe for non-potable water conforming dimensionally to A WW A C900 (DR 25) or A WW A C905 (DR 25). a. Gravity drain pipe schedule: 4-inch b. Process pipe directional boring sleeve schedule: Process Pipe Size Directional Boring Pipe Size 8" 16" 6" 14" 4" 12" 2. Fusible polyvinylchloride pipe shall be extruded with plain ends. The ends shall be square to the pipe and free of any bevel or chamfer. There shall be no bell or gasket of any kind incorporated into the pipe. 3. Pipe color shall be green or white in color 4. Pipe shall be marked with nominal pipe size, dimension ratio, standard dimension ratio, or schedule, A WW A pressure Class, and A WW A standard designation number. 5. Pipe shall be homogenous throughout and be free of visible crack, holes, foreign material, blisters, or other visible deleterious faults. 6. Pipe lengths shall be assembled with butt-fused joints. All pipe supplier's guidelines shall be followed for butt fusion procedure. C. B. Drilling Fluid. 1. Bentonite drilling mud compatible with the environment. 2. Waste oil or environmentally non-compatible polymers cannot be part of composition. D. Detection Wire: THWN, insulated copper, 8 gauge or thicker wire. PART 3 -EXECUTION 3.1 PREPARATION A. Excavate pits as required. B. Provide equipment to guard against electrocution and an alarm system on drilling equipment capable of detecting electrical current as it approaches electric lines. 3.2 OPERATION A. General. 1. Determine drilling length and equipment pull strength for type of soil encountered. HORIZONTAL DIRECTIONAL DRILLING Cl408-01

3 2. Provide method to control line and grade. a. Provide and maintain instrumentation that accurately locates pilot hole. b. Include electronic monitoring of horizontal and vertical drilling head location. Obtain accuracy range within 1% of the horizontal distance of the borehole and vertically within 2% of the vertical depths of the borehole. Record position readings at maximum of 10 foot intervals. c. At completion of pilot hole drilling, furnish Engineer tabulations of horizontal and vertical alignment. 3. When water is encountered. a. Provide and maintain dewatering system of sufficient capacity to remove water. b. Keep excavation free of water until backfill operation is in progress. c. Perform dewatering in such a manner that removal of soils particles are held to a minimum. d. Dewater into sediment trap. 4. Maintain close observation to detect settlement or displacement of surface and adjacent facilities. B. Drilling Operation. 3.3 INSTALLATION a. Notify Engineer and applicable agency immediately if settlement or displacement is detected. b. Maintain safe conditions and prevent damage. 1. Drilling Fluids. a. Maintain drilling fluid in bore hole to increase stability of surrounding soil and reduce drag on pulled pipe. b. Dispose of drilling fluid and other spoils at location following laws, ordinances, rules, and regulations of local jurisdiction. c. Transport excess fluids and other spoils to disposal site. d. Minimize drilling fluid at locations other than entry and exit points. Immediately clean up any drilling fluids that inadvertently surface. e. Provide clean water for drilling. 2. Pilot Hole Drilling. A. Installing Pipe. a. Angle entry hole so that curvature of pilot hole does not exceed allowable bending radius of proposed pipe. 1. Provide a swivel to reaming assembly and pull section of pipe to minimize torsional stress on pull section after drilling pilot hole. 2. Hold reaming diameter to 1.5 times outside diameter of HDPE pipe being installed. HORIZONTAL DIRECTIONAL DRILLING C1408-0l

4 3. Protect pull section as it proceeds during pull back so it moves freely and is not damaged. 4. Install detection wire on the outside of the HDPE pipe by pulling detection wire along with pipe. Extend wire into receiving vault on each end of pipe. END OF SECTION HORIZONTAL DIRECTIONAL DRILLING Cl408-0l

5 SECTION STORM UTILITY DRAINAGE PIPING 1.1 SUMMARY PART 1- GENERAL A. Provide storm sewerage system in accordance with provlslons of the Standard Specifications for Highway Construction, Missouri Department of Transportation as shown on the Drawings, and as specified herein. PART 2 -PRODUCTS 2.1 PIPE MATERIALS FOR SEWERS A. Sewer pipe shall comply with Sections 1020 of the Standard Specifications for the type, class, and size of pipe as shown on the Plans and as described herein: 1. Corrugated Steel Pipe: a. Conforming to Section B. Manholes, Inlets, and Drainage Structure materials shall comply with applicable Sections 604, 726, 731, 732, and 733 of the Standard Specifications for the type of structure, frame and grate or lid as shown on the Plans and as described herein. C. End Sections shall be in accordance with Section 732 of the Standard Specifications for the type and size specified on the plans. D. Grating for Reinforced Concrete End Sections shall conform to Section 732. PART 3 -EXECUTION 3.1 INSTALLATION A. Storm sewer pipe and structures shall be installed in accordance with applicable Sections 604, 605, 726, 731, 732, and 733 ofthe Standard Specifications. B. Excavation and backfilling for sewers, manholes, structures and appurtenances, shall comply with governing Federal and State laws, and Local Ordinances as may be necessary to protect life, property, or the work. In any event, the minimum protection shall conform to the rules and regulations of the Occupational Safety and Health Act (OSHA) Standards for Construction. C. Backfilling Trenches: 1. Backfill above the center line of the pipe shall be in accordance with Section 726 of the Standard Specifications, as shown on the Drawings. 2. Aggregate trench backfill shall be placed beneath and within 2 ft. of areas of proposed pavements, walks, footings, foundations, slabs or other structures. 3. When trench backfill material is specified, compaction of the backfill shall be in accordance with Section D. Rock Ditch Liner: STORM UTILITY DRAINAGE PIPING C

6 1. Riprap shall be in accordance with Section 609 of the Standard Specifications. 2. Filter fabric or a bedding layer will not be required unless specified on the plans. E. Manholes And Water Valves: 1. Final adjustment of manholes frames and valve boxes in pavement areas shall be completed after the binder course has been placed and prior to placement of the surface course. The adjustments shall be in accordance with Section 604 of the Standard Specifications. Bituminous patching material shall be temporarily placed around any manhole lid or water valve above the binder layer until the bituminous surface is placed. END OF SECTION STORM UTILITY DRAINAGE PIPING C1408-0l