SECTION 02367

PRESTRESSED CONCRETE PILES

PART 1 GENERAL

SECTION INCLUDES

Prestressed precast concrete piles[.] [with steel point.]

RELATED WORK

Section [_____] - Information Available To Bidders: Subsurface Investigation Report.

Section [01400 - Quality Control] [01410 - Testing Laboratory Services]: Testing laboratory services.

Section 02222 - Excavation: Excavation to working level.

Section 02356 - Pile Load Tests:	Requirements for pile load tests.

Section [______-____________]: Pile caps[.] [and grade beams.]

UNIT PRICES

Design Pile Quantity: Determined by quantity of piles indicated in the Contract Documents.

Design Pile Length: Based on the length from base to top elevation [of [____] ft ([____] m).] [as indicated.] Test Piles: [5] [____] ft ([1.5] [____] m) longer than design length piles.

Contract Pile Quantity: Determined by quantity of piles identified in the Project Record Documents.

Actual Pile Length: Determined by length of piles identified in Project Record Documents.

Adjustments in Contract Price will be made due to changes in number and length of piles, based on unit prices established in the Agreement as follows:

Contract Pile Quantity, and [____________________.]

Contract unit price per unit length including test piles, multiplied by the Actual Pile Length. Base measurement on total linear measurement of piling from base to top elevation, except for test piles calculated at [5] [____] ft ([1.5] [____] m) longer.

Determination of Unit Measurements: [Identified by site measurements and verified by the Architect/Engineer.] [________________.]

PERFORMANCE REQUIREMENTS

Drive piles to refusal of not less than [____] blows to achieve [____] inches of additional depth.

****** [OR] ******

Drive piles to [defined load supporting capacity.] [load supporting capacity of [____] lb ([____] kg).] [__________.]

Avoid damaging piles by over driving.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate details and schedule of pile installation sequence. Identify [recommended] pile length and size to suit design requirements.

Product Data: Provide details of [points,] [splices,] cushion blocks [and][.] [________________.]

PROJECT RECORD DOCUMENTS

Submit under provisions of Section [01700.] [________.]

Accurately record the following:

Sizes, lengths, and locations of piles.

Sequence of driving.

Number of blows per foot (meter) for entire length of piles and measured set for last [10] [____] blows.

Piles requiring drilling and the hole diameters.

Final base and top elevations.

Driving force of each hammer blow.

QUALIFICATIONS

Installer: Company specializing in performing the work of this Section with minimum [__________] years [documented] experience.

Design and select pile components under direct supervision of a Professional Structural Engineer experienced in design of this work and licensed [at the place where the Project is located.] [in the State of [____________].]

REGULATORY REQUIREMENTS

Conform to [applicable] [___________] code for seismic requirements for piling.

Provide certificate of compliance from [authority having jurisdiction] [________________] indicating approval.

PRE-INSTALLATION CONFERENCE

Convene [one] [_____] week prior to commencing work of this Section, under provisions of Section [01039.] [________.]

FIELD MEASUREMENTS

Verify that field measurements and survey benchmarks are as indicated on Drawings.

SCHEDULING

Schedule Work under the provisions of Section [01300.] [________.]

Schedule Work to perform driving during [____] and [____] hours.

Schedule [test] [indicator] piles.

PART 2 PRODUCTS

MATERIALS

Concrete: Minimum [5000] [8000] [____] psi ([34] [55] [____] MPa) 28 day strength, [Normal] [Sulphate Resistant] Portland cement; aggregates and sand as recommended by pile manufacturer.

Reinforcing Steel: Tensioning steel tendons and deformed steel bars.

Pile Points:	Hardened steel, hollowed tip to minimize bounce or deflection.

Pile Section Joint Ends:	Male and female, with positive lock, formed steel.

Shop fabricate pile in maximum practical lengths to meet design requirements.

SOURCE QUALITY CONTROL

Provide shop [testing and] inspection of piles under provisions of Section [01400.] [01410.] [________.]

Test sample piles in accordance with [________.]

PART 3 EXECUTION

EXAMINATION

Verify site conditions under provisions of Section [01039.] [________.]

Verify that site conditions will support driving equipment for performing pile driving operations[.] [and testing.]

PREPARATION

[Obtain prior approval of hammer type to be used.]

Use driving method which will not cause damage to nearby

structures.

Notify adjacent and affected land owners and building occupants [with [____] days] notice before proceeding with the Work.

Protect structures near the Work, from damage.

DRILLING

Drill holes to facilitate driving only if piling cannot be completed in specified manner. Drill only through strata obstructing driving.

Hole Diameter: Maximum [1] [____] inch ([25] [____] mm) [larger] [smaller] than tip dimension.

INSTALLATION

Protect pile head during driving, using [cushion cap] [________] with full bearing on pile butt for even distribution of hammer blow.

Deliver hammer blows to central axis of pile.

If driving is interrupted before refusal, drive an additional [12] [____] inches ([300] [____] mm) before resuming recording of performance data.

Re-drive piles which have lifted due to driving adjacent piles, or by soil uplift.

Prepare pile top to receive [pile cap.] [grade beams.] [________.]

TOLERANCES

Maximum Variation From Vertical For Plumb Piles:	1 in [48.] [____.]

Maximum Variation From Required Angle For Batter Piles: 1 in [24.] [____.]

Top Cut-off Elevation: Maximum [4] [____] inches ([100] [____] mm) from elevation indicated.

FIELD QUALITY CONTROL

Field inspection will be performed under provisions of Section [01400.] [01410.] [________.]

Perform load tests to requirements of Section [02356.] [________.]

Test Piles: Same diameter and type as specified for other piling, placed in same manner.

Accepted test piles may [not] be used in the Work.

UNACCEPTABLE PILES

Unacceptable Piles: Piles that fail tests, are placed out of position, are below cut-off elevations, or are damaged.

Provide additional piles or replace piles to conform to specified requirements.

END OF SECTION