615.1 General Description
This work includes installing different sizes and types of pipe by jacking or boring through various materials.
615.1.01 Definitions
General Provisions 101 through 150.
615.1.02 Related References
A. Standard Specifications Section 205—Roadway Excavation Section 208—Embankments Section 550—Storm Drain Pipe, Pipe-Arch Culverts, and Side Drain Pipe Section 841—Iron Pipe Section 847—Miscellaneous Pipe B. Referenced Documents General Provisions 101 through 150.
615.1.03 Submittals
A. Handling Method Furnish for the Engineer’s approval, a plan showing the proposed method of handling, including: • Design for the jacking head, jacking support, or back stop • Arrangement and position of jacks, pipe guides, etc., complete as assembled B. Welding Procedure Before welding steel pipe or ductile iron pipe as casing and carrier, submit to the State Materials and Research Engineer a written welding procedure. Include joint details, preheat temperature, and electrodes to be used. Do not use welded steel pipe as a sanitary sewer carrier.
615.2 Materials
Use pipe types and sizes that conform to the plans and the following: Material Section Corrugated Metal Pipe 550 Concrete Pipe 550 Steel Pipe 847.2.02 Ductile Iron Pipe (Plain Ends) 841
615.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
615.3 Construction Requirements
615.3.01 Personnel
General Provisions 101 through 150.
615.3.02 Equipment
General Provisions 101 through 150.
615.3.03 Preparation
General Provisions 101 through 150.
615.3.04 Fabrication
General Provisions 101 through 150.
615.3.05 Construction
Dispose of the excavated material from the following jacking or boring operations or use it as directed by the Engineer at no additional cost to the Department. A. Jacking Follow these requirements when jacking: 1. Excavate suitable pits or trenches for the jacking operation and for placing the end joints of pipe, when required. Securely sheet and brace the pits or trenches to prevent caving, where necessary. 2. When installing pipe under railroads, highways, streets, or other facilities by jacking or boring, perform construction and prevent: • Interfering with the facility operation • Weakening the roadbed or structure 3. To force the pipe through the roadbed, use a jack with a head constructed to apply uniform pressure around the ring of the pipe. 4. Set the pipe to be jacked on guides, braced together to properly support the pipe section and to direct it to the proper line and grade. 5. Excavate the roadbed as follows: a. Excavate roadbed material just ahead of the pipe. b. Remove the excavated material through the pipe. c. Ensure that the excavation diameter conforms to the outside diameter and circumference of the pipe as closely as possible. 6. Force the pipe through the roadbed into the excavated space. 7. Use an approved mix to pressure grout voids that develop during installation and that the Engineer determines are detrimental to the work. 8. Ensure that the excavation does not extend beyond the pipe more than 2 ft. (600 mm). Decrease the distance at the Engineer’s direction or if the character of the excavated material allows. 9. Jack the pipe from the low or downstream end. The line and grade from the pipe’s final position established by the Engineer may vary no more than two percent in lateral alignment and one percent in vertical grade. Ensure that the final grade of the flow line is in the direction indicated on the plans. 10. Use a cutting edge around the head end. Extend it a short distance beyond the pipe end with inside angles or lugs to keep the cutting edge from slipping back into the pipe. 11. Once the pipe jacking has begun, proceed with the operation without interruption to prevent the pipe from becoming firmly set in the embankment. 12. Remove and replace pipe damaged in jacking operations at no additional expense to the Department. 13. After completing the jacking, immediately backfill the excavated pits or trenches. B. Boring Proceed with the boring from a pit provided for boring equipment and workmen. Complete these steps: 1. Excavate for pits and shoring installation as outlined above. 2. Locate the pit at the Engineer’s approval. 3. Bore the holes mechanically using a pilot hole approximately 2 in. (50 mm) in diameter that is bored the entire length of the installation. a. Check the pilot hole for line and grade on the opposite end of the bore from the work pit. b. Use the pilot hole to serve as the center line of the larger diameter hole to be bored. 4. Place excavated material near the top of the working pit and dispose of it as required. Use water or other fluids with the boring operation to lubricate the cuttings. Do not perform jetting. 5. In unconsolidated soil formations, use a gel-forming collodial drilling fluid with at least 10 percent of high grade carefully processed bentonite to consolidate excavated material, seal the walls of the hole, and lubricate subsequent removal of material and immediate pipe installation. 6. Ensure that the diameter of the excavation conforms to the outside diameter of the pipe as closely as possible. 7. See Subsection 615.3.05.A, Jacking, for the allowable variation from line and grade. 8. Use an approved mix to pressure grout voids that develop during the installation operation and that the Engineer determines are detrimental to the Work.
615.3.06 Quality Acceptance
General Provisions 101 through 150.
615.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
615.4 Measurement
Pipe installed by jacking or boring is measured by the linear foot (meter) of pipe complete in place. Measurement is made between the ends of the pipe along the control axis as installed.
615.4.01 Limits
General Provisions 101 through 150.
615.5 Payment
Work performed and materials furnished as prescribed by this item and measured as provided above will be paid for at the Contract Price per linear foot (meter) for jacking and boring of the pipe type, size, and class specified. Payment is full compensation for furnishing the pipe and the incidentals to complete the Item. Excavation will not be paid for separately but will conform to Section 205 and Section 208. Payment will be made under: Item No. 615 Jack or bore pipe (type), (class), (size) Per linear foot (meter)
615.5.01 Adjustments
General Provisions 101 through 150.
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