SECTION 02364

CONCRETE FILLED STEEL PILES

PART 1 GENERAL

SECTION INCLUDES

Driven steel pipe shell, filled with [reinforced] concrete, end bearing.

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.]

Section 03200 - Concrete Reinforcement: Requirements for concrete reinforcement.

Section 03300 - Cast-In-Place Concrete: Requirements for concrete.

REFERENCES

ASTM A252 - Welded and Seamless Steel Pipe Piles.

UNIT PRICES

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

Design Pile Length: Based on the length from bearing surface to top of pile 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 of pile 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 schedules of pile installation identify recommended pile lengths and diameters to suit design requirements, [reinforcing requirements] [and][.] [_______________.]

PROJECT RECORD DOCUMENTS

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

Accurately record the following:

Sizes, lengths, and locations of piles.

Sequence of driving.

Drilling: Hole diameters.

Final base and head elevations.

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

Pipe Shells: ASTM A252, Grade [T1] [T1a] [T1b]; single length steel pipe, [seamless] [welded], [straight longitudinal seam] [spiral butt] [spiral lapped], with [plain] [bevelled] [flame] [machine] cut ends, [[__________] nominal diameter, [__________] wall thickness][;][.] [with conical tip.]

[Reinforcement: Specified in Section [03200] [_____] [spiral wound].]

Concrete Materials and Mix: Specified in Section [03300] [_____] using Type [_____] cement, maximum [___] aggregate size, [_____] psi ([___] MPa) 28 day strength, [___] inch ([___] mm) slump.

Admixture: [Accelerator type.] [_______________.]

Pile Cushion Cap: [Formed and welded steel.] [_______________.]

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 at [__________] levels of subsoil strata. Drill only through strata obstructing driving.

Hole Diameter: Maximum [1] [___] inch ([25] [___] mm) [larger] [smaller] than pipe diameter.

INSTALLATION

Protect pile head during driving using [cushion cap] [__________] with full bearing on pile for even distribution of hammer blow. Deliver hammer blows to central axis of pile.

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

Set tops of piles to elevations indicated.

Remove soil and foreign matter from pile shell. [Auger] [Churn drill] shaft bottom into bearing stratum. Clean shaft bottom with flushing water. Pump dry.

Allow inspection of pile casing prior to placement of [reinforcement and] concrete.

Place reinforcing steel in accordance with Section [03200.] [_____.] Prevent foreign matter from entering shaft.

Place concrete in accordance with Section [03300] [_____], with equipment designed for vertical placement of concrete. Vibrate concrete full depth of pile.

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

[Extend reinforcement] [Provide dowels] for subsequent connection of [pile caps.] [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 of Pile 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