SECTION 819 MICROTUNNELING AND PIPE-JACKED TUNNELS ...

. Materials:
1. Submit pipe material reference sheets and manufacturer’s certification of pipe
meeting or exceeding the required specifications.
2. Submit a description of materials, grout mix, equipment and operational
procedures to accomplish each grouting operation. The description may include
sketches as appropriate, indicating type and location of mixing equipment,
pumps, injection points, venting method, flowlines, pressure measurement,
volume measurement, grouting sequence, schedule, and stage volumes.
i. Submit a grout mix design report, including:
A. Grout type and designation.
B. Grout mix constituents and proportions, including materials by weight
and volume.
C. Grout densities and viscosities, including wet density at point of
placement.
D. Initial set time of grout.
E. Bleeding, shrinkage/expansion.
F. Compressive strength.
ii. For cellular grout, also submit the following:
A. Foam concentrate supplier's certification of the dilution ratio for the foam
concentrate.
B. A description of the proposed cellular grout production procedures.
iii. Maintain and submit logs of grouting operations indicating pressure, density,
and volume for each grout placement.
c. Tunneling Methodology: A brief description of proposed tunnel methodology for
review. The description should be sufficient to convey the following:
1. Proposed method of tunnel construction and type of face support.
2. Manufacturer and type of tunneling equipment proposed. Describe type of lighting
and ventilation systems.
3. Number and duration of shifts planned to be worked each day.
4. Sequence of operations.
5. Locations of access shafts and work sites. Describe method of construction for
tunnel shafts.
6. Method of spoil transportation from the face, surface storage and disposal
location.
7. Capacity of jacking equipment and type of cushioning.
8. Identify critical utility crossings and special precautions proposed.
9. Slurry injection system details.
d. Tunnel Shaft Schedule of Values: Cost per shaft by station, diameter, and depth.