Page 252 - Villas at Savona Close-out Manual

C. Movement Monitoring System. The contractor shall provide instrumentation to detect any
movement of the ground surface or any structure within a radius of 30 ft from any hole being
grouted. The monitoring devices shall be capable of detecting movements of 1/16 in. or more in
any direction.
The instrumentation may include but is not limited to string lines, telltales, manometers,
lasers, and optical devices. Backup surveyor’s instruments shall be provided in such
quantity as to allow evaluation of the movement of all structures without the necessity of
moving the instrument during injection. The original position of all structures shall be
established before grout injection by the placement of suitable markings or targets
thereon.
The contractor shall dedicate experienced and fully qualified personnel to monitor the
instrumentation to prevent any damage to the site or structures. Any damage that does
occur because of insufficient instrumentation or monitoring effort shall be repaired or
replaced by the contractor at no cost to the owner.

D. Communication System. The contractor shall provide a communication system that allows
immediate voice contact between the people at the grout hole, pump operator, and monitoring
personnel. Any damage that occurs as a result of lack of immediate communication shall be
repaired or replaced by the contractor at no cost to the owner.

3.2 CEMENT GROUT EQUIPMENT

A. Grout Casing
The casing shall be a minimum of 1 3/4 in., maximum of 3 in. internal diameter and possess
sufficient strength to withstand the drilling and driving, grout injection, and withdrawal forces
required for the work. It shall have flush joints on both the interior and exterior surfaces. The joints
may be threaded or welded. The maximum casing joint length shall be 5 ft unless withdrawal is by
the drill rig or similar equipment and real-time computer monitoring is being used. In such a case,
an additional pressure transducer shall be provided at the header.
Any casing or holes lost because of broken or bent casing, insufficient casing strength, or the
contractor’s inability to pull the casing shall be abandoned, and new replacement holes shall be
drilled and grouted at the contractor’s expense.

B. Casing Withdrawal System
The casing withdrawal system shall be capable of withdrawing the casing in the required stages
under both normal and extraordinary conditions. Any hole lost because of the contractor’s inability
to pull the casing shall be replaced with a new hole at the contractor’s expense.

C. Grout Batcher/Mixer
The grout mixing system shall be capable of precisely proportioning the mix constituents and
blending them into a homogeneous grout of uniform consistency. It shall be capable of
continuously proportioning and mixing the grout in sufficient quantity, without interruption caused
by inadequate proportioning or mechanical limitations.
Automatic volumetric proportioning and mixing systems complying with the requirements of
ASTM C885 and/or ACI 304 shall be acceptable. Where used, automatic metering systems shall be
calibrated in the presence of the engineer before the beginning of grout injection and at any
additional times required by the engineer. Properly calibrated volumetric containers and scales

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HEERUP ENGINEERING, PC January 16
Villas at Savona 03229