City of Frisco Engineering Standards

F. All Work shall be done so as not to disturb roadways, adjacent structures, landscaped areas,
or existing utilities. Any damage shall be immediately repaired to original or better condition
and to the satisfaction of Engineer.
3.02 INSTALLATION OF CARRIER PIPE
A. Pipe Installation: Carrier pipe shall meet the requirements of the applicable Specification
section. Remove all loose soil from casing. Grind smooth all rough welds at casing joints.
Provide casing spacers, or insulators, or other approved devices, as required, to prevent
flotation, movement, or damage to the pipe during installation and annular space grout
placement. Every individual pipe section should be supported by spacers as shown in the
City’s Standard Details. Carrier pipe shall be installed without sliding or dragging it on the
ground or in the casing in a manner that could damage the pipe. Coat the casing spacer
runners with a non-corrosive/environmentally safe lubricant to minimize friction when
installing the carrier pipe.
B. Testing of Carrier Pipe: Testing of the carrier pipe joints shall be completed prior to the
filling of the annular space between the casing and carrier pipe with grout. Pressure testing
shall be performed in accordance with the specification for the selected pipe material. Any
leakage found during this inspection shall be corrected.
C. Backfill Annular Space with Grout: After the installation of the carrier pipe, the annular
space (all voids) between the casing and the carrier shall be filled with grout so all remaining
surfaces of the exterior carrier pipe wall and casing interior are in contact with the grout.
Furnish the necessary grout, equipment, hoses, valves, and fittings for the backfilling
operation. Grout shall be pumped through a pipe or hose. Use grout pipes, or other
appropriate materials to avoid damage to carrier pipe during grouting. The grout shall be
proportioned to flow and to completely fill all voids between the carrier pipe and the casing.
The Contractor shall provide end seals, as approved by the Engineer at each end of the casing
to contain the grout backfill. The end seals shall be designed to withstand the anticipated
grouting pressure and be watertight to prevent groundwater from entering the casing. Block
the carrier pipe during grouting to prevent flotation during grout installation. The Contractor
shall also protect and preserve the interior surfaces of the casing from damage. It is the
responsibility of the Contractor to submit to the Engineer sufficient information indicating all
proposed equipment, materials, and the method for filling this void.
3.03 SAFETY
A. The Contractor is responsible for safety on the job site. Perform all Work in accordance with
the current applicable regulations of the Federal, State, and local agencies. In the event of
conflict, comply with the more restrictive applicable requirement.
B. No gasoline powered equipment shall be permitted in jacking shafts and receiving shafts/pits.
Diesel, electrical, hydraulic, and air powered equipment is acceptable, subject to applicable
local, state, and federal regulations.
C. Methods of construction shall be such as to ensure the safety of the Work, Contractor's and
other employees on site, and the public.
D. Furnish and operate a temporary ventilation system in accordance with applicable safety
requirements when personnel are underground. Perform all required air and gas monitoring.
City of Frisco May 2012
Standard Technical Specification Trenchless Utility Installation 330523-3