Goggle Works – Building 2
SECTION 02250 - SHORING AND BRACING
PART ONE – GENERAL
1.1 SECTION INCLUDES
A. Extent of shoring and bracing work includes, but is not limited to, the following:
1. Shoring and bracing necessary to protect existing buildings, walkways, utilities, and other
improvements and excavations against loss of ground or caving embankments.
2. Removal of shoring and bracing, as required.
B. Types of shoring and bracing systems that can be used include, but are not limited to, the following:
1.
2.
3.
4.
5.
Steel H-section (soldier) piles.
Timber lagging.
Steel sheet piles.
Aluminum Hydraulic Shoring.
Trench Box.
1.2 RELATED DOCUMENTS
A. Drawings and general provisions of Contract, including General Conditions and Supplementary
General Conditions and Division 01000 Specification sections, apply to work of this section.
1.3 RELATED SECTIONS
A. The work of the following Sections applies to the work of this Section. Other Sections of the
Specifications, not referenced below, shall also apply to the extent required for proper performance of
this work.
1. Section 02240
Dewatering
2. Section 02300
3. Section 02310
4. Section 02620
Excavating, Filling and Grading
Trenching, Backfilling and Compacting
Building and Foundation Drainage
1.4 QUALITY ASSURANCE
A. Regulations: Comply with local codes and ordinances of the Construction Standard for Excavation
promulgated by the Occupational Safety and Health Administration (OSHA).
B. Supervision: Engage and assign supervision of excavation support system to a qualified professional
employee or consultant.
1.5 JOB CONDITIONS
A. Before starting work, verify governing dimensions and elevations. Verify condition of adjoining
properties. Take photographs to record any existing settlement or cracking of structures, pavements,
and other improvements. Prepare a list of such damages, verified by dated photographs, and signed
by Contractor and others conducting investigations.
B. Survey adjacent structures and improvements, establishing exact elevations at fixed points to act as
benchmarks. Clearly identify benchmarks and record existing elevations.
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Goggle Works – Building 2
C. During excavation, re-survey benchmarks as needed, maintaining accurate log of surveyed
elevations. Promptly notify Architect if changes in elevations occur or if cracks, sags, or other
damage is evident.
1.6 EXISTING UTILITIES
A. Protect existing active utility services and structures.
B. Notify Owner and service utility companies having jurisdiction.
PART TWO – PRODUCTS
2.1 MATERIALS
A. General: Provide adequate shoring and bracing materials that will support loads imposed. Materials
need not be new, but should be in serviceable condition.
B. Structural Steel: ASTM A 36.
C. Steel Sheet Piles: ASTM A328.
D. Timber Lagging: Any species, rough-cut, mixed hardwood, nominal 3 inches thick, unless otherwise
indicated.
E. Trench Box (Trench Shield): Portable, prefabricated shield system used with trench excavations to
withstand the forces imposed on it by a cave-in.
F. Aluminum Hydraulic Shoring: Pre-engineered shoring system comprised of hydraulic cylinders used
in conjunction with vertical rails or horizontal rails. System shall be used to support the sidewalks of
an excavation and prevent cave-ins.
PART THREE – EXECUTION
3.1 GENERAL
A. Wherever excavations are required to a depth greater than 5 feet, the Contractor shall provide means
of shoring and/or bracing meeting these requirements.
3.2 SHORING
A. Wherever shoring is required, locate the system to clear permanent construction and to permit
forming and finishing of concrete surfaces. Provide shoring system adequately anchored and braced
to resist earth and hydrostatic pressures.
B. Shoring systems retaining earth on which the support or stability of existing structures is dependent
must be left in place at completion of work.
3.3 BRACING
A. Locate bracing to clear framing construction, and other permanent work. If necessary to move a
brace, install new bracing prior to removal of original brace.
B. Do not place bracing where it will be cast into or included in permanent concrete work, except as
otherwise acceptable to Engineer.
C. Install internal bracing, if required, to prevent spreading or distortion of braced frames.
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Goggle Works – Building 2
D. Maintain bracing until structural elements are supported by other bracing or until permanent
construction is able to withstand lateral earth and hydrostatic pressures.
E. Remove sheeting, shoring, and bracing in stages to avoid disturbance to underlying soils and
damage to structures, pavements, facilities, and utilities.
F. Repair or replace, as acceptable to Architect, adjacent work damaged or displaced through
installation or removal of shoring and bracing work.
END OF SECTION
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