HomeMy WebLinkAbout31 50 00 - Excavation Support and ProtectionMidtown West 17070
Carmel, Indiana September 15, 2017
31 50 00 - 1
SECTION 31 50 00 - EXCAVATION SUPPORT AND PROTECTION
PART 1 - GENERAL
1.1 SUMMARY
A. Section includes temporary excavation support and protection systems.
1.2 PERFORMANCE REQUIREMENTS
A. Design, furnish, install, monitor, and maintain excavation support and protection system capable
of supporting excavation sidewalls and of resisting soil and hydrostatic pressure, and
superimposed and construction loads.
1. Delegated Design: Design excavation support and protection system, including
comprehensive engineering analysis by a qualified professional engineer, using
performance requirements and design criteria indicated.
1.3 ACTION SUBMITTALS
A. Shop Drawings: For excavation support and protection system.
B. Delegated-Design Submittal: For excavation support and protection system indicated to comply
with performance requirements and design criteria, including analysis data signed and sealed
by the qualified professional engineer responsible for their preparation.
1.4 QUALITY ASSURANCE
A. Preinstallation Conference: Conduct conference at Project site.
1.5 PROJECT CONDITIONS
A. Survey Work: Engage a qualified land surveyor or professional engineer to survey adjacent
existing buildings, structures, and site improvements; establish exact elevations at fixed points
to act as benchmarks. Clearly identify benchmarks and record existing elevations.
1. During installation of excavation support and protection systems, regularly resurvey
benchmarks, maintaining an accurate log of surveyed elevations and positions for
comparison with original elevations and positions. Promptly notify Construction Manager
if changes in elevations or positions occur or if cracks, sags, or other damage is evident
in adjacent construction.
Midtown West 17070
Carmel, Indiana September 15, 2017
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PART 2 - PRODUCTS
2.1 MATERIALS
A. General: Provide materials that are either new or in serviceable condition.
B. Structural Steel: ASTM A 36, ASTM A 690, or ASTM A 992.
C. Steel Sheet Piling: ASTM A 328, ASTM A 572, or ASTM A 690; with continuous interlocks.
D. Wood Lagging: Lumber, mixed hardwood, nominal rough thickness of size and strength
required for application.
E. Cast-in-Place Concrete: ACI 301, of compressive strength required for application.
F. Reinforcing Bars: ASTM A 615, Grade 60, deformed.
PART 3 - EXECUTION
3.1 INSTALLATION
A. Soldier Piles: Install steel soldier piles before starting excavation. Extend soldier piles below
excavation grade level to depths adequate to prevent lateral movement. Space soldier piles at
regular intervals not to exceed allowable flexural strength of wood lagging. Accurately align
exposed faces of flanges to vary not more than 2 inches from a horizontal line and not more
than 1:120 out of vertical alignment.
1. Fasten wood lagging to flanges of soldier piles as excavation proceeds. Trim excavation
as required to install lagging. Fill voids behind lagging with soil, and compact.
2. Install wales horizontally at locations indicated on Drawings and secure to soldier piles.
B. Sheet Piling: Before starting excavation, install one-piece sheet piling lengths and tightly
interlock to form a continuous barrier. Accurately place the piling, using templates and guide
frames unless otherwise recommended in writing by the sheet piling manufacturer. Limit
vertical offset of adjacent sheet piling to 60 inches. Accurately align exposed faces of sheet
piling to vary not more than 2 inches from a horizontal line and not more than 1:120 out of
vertical alignment. Cut tops of sheet piling to uniform elevation at top of excavation.
C. Bracing: Locate bracing to clear columns, floor framing construction, and other permanent
work. If necessary to move brace, install new bracing before removing original brace.
1. Do not place bracing where it will be cast into or included in permanent concrete work
unless otherwise approved by the Construction Manager.
2. Install internal bracing, if required, to prevent spreading or distortion of braced frames.
3. Maintain bracing until structural elements are supported by other bracing or until
permanent construction is able to withstand lateral earth and hydrostatic pressures.
3.2 REMOVAL AND REPAIRS
A. Remove excavation support and protection systems when construction has progressed
sufficiently to support excavation and bear soil and hydrostatic pressures. Remove in stages to
avoid disturbing underlying soils or damaging structures, pavements, facilities, and utilities.
Midtown West 17070
Carmel, Indiana September 15, 2017
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1. Remove excavation support and protection systems to a minimum depth of 48 inches
below overlaying construction and abandon remainder.
B. Leave excavation support and protection systems permanently in place.
END OF SECTION 31 50 00