Page 253 - Villas at Savona Close-out Manual

required for proper calibration shall be provided by the contractor.
Batch-type mixers may be used subject to provision of an accurate means of proportioning the
individual grout constituents.

D. Grout Pump
The pump shall be of the piston type and shall have a grout pumping piston no greater than 4 in. in
diameter. It shall provide positive displacement of the grout and be capable of pumping at variable
rates of 0.2 to 2 ft³/minute at continuous pressures of as much as 1,000 lb/in²
The pump shall be operated within specification and capable of complete filling of the grout
cylinders on each stroke. It shall be equipped with a force feed or other mechanism as required to
ensure such complete filling. Short-stroking of the pump shall not be allowed, and any grout
pumped during such malfunctions shall be at the contractor’s expense.
A remote off-on control for the pump shall be provided at the grout injection point. An accurate
system to measure the quantity of grout pumped at any time interval shall be provided. The grout
volume measuring system shall be calibrated by the contractor each day of pumping at the
beginning of work and at any other time that short-stroking or a change of the grout pumping rate
is suspected.

E. Grout Delivery Line
The grout delivery line shall consist of high-pressure flexible hose or a combination of hose and
rigid pipe- line and shall be watertight under pressure. It shall be a maximum of 2 in. diameter. All
components of the delivery line, including coupling clamps, shall be in good condition and capable
of handling the pumping pressures to be used with a minimum safety factor of 2. A pressure test of
the delivery line to confirm its conformance herewith shall be performed as required by the
engineer.

F. Pressure Gauges
Pressure gauges shall be installed at the grout pump and at the grout header (top of hole casing).
All gauges shall be accurate and in good working order. They shall be protected from grout
intrusion by suit- able gauge protectors. Gauges shall have a minimum dial diameter of 3 in., and
the maximum pressure range shall be not greater than 150% of the anticipated maximum grout
pressure. A sufficient number of spare pressure gauges shall be maintained on the job site, and any
gauge of questionable accuracy shall be promptly replaced.

3.3 FOAM GROUT EQUIPMENT
Provide at a minimum, the following equipment:

A. . Truck-Mounted Pumping Unit. Provide a truck-mounted pumping unit capable of injecting the
high density polyurethane material beneath the pavement. The pumping unit will be capable of
controlling the rate of flow of material as required to densify soils. The unit will be equipped with
a manufacturer’s certified flow meter to measure the amount of high-density polyurethane injected
at each location and will have a digital output in both pounds and gallons.

B. Pressure and Temperature Control Devices. Provide pressure and temperature control devices
capable of maintaining proper temperature and proportionate mixing of the polyurethane
component materials.

5
HEERUP ENGINEERING, PC January 16
Villas at Savona 03229