Helical_Piles_and_Drive_Specifications.pdf

ROMO FY23 Helical Piles for Sprague Lake Boardwalk

Description: Helical piles, pile caps, and drive head needed for the construction of the Sprague Lake Boardwalk.

Item: Lead and extension helical piles with hardware, and pile caps.

Shop Drawings

Shop drawings for pile components shall be sealed by a registered Professional Engineer.

Elements of the helical piers and pile caps are indicated on drawings and shall be fabricated in accordance with IBC 2018 and ASCE 7-10.

As referenced throughout specifications, please see drawings (Sprague Lake Boardwalk Plans and Layout)

Design Loads: Design loads are as indicated on drawings.

A. Minimum Safety Factor of two (2)

Materials

1. 35 – 5’ Round Shaft lead piles

2. 100 – 7’ RS extension piles with hardware

3. 35 – pile caps with hardware

Specifications:

A. All materials shall be new.

B. Helical Piles: The central shaft of the lead and extension sections to be cold formed welded and seamless carbon steel structural round tubing ASTM A500 Grade B, ASTM A618, or ASTM A252 Grade 3

1. 3-1/2” inches outside diameter, 0.300 inch wall thickness

2. Minimum yield strength of 42ksi

3. Minimum tensile strength of 58ksi

4. Lead Piles: meet the dimensional and workmanship requirements of ASTM A500, with two (2) helical plates welded to the shaft as shown in Detail 1 of Sheet S-2.

i. 1 – 10” helix welded 5” from pile tip.

ii. 1 – 12” helix welded 2’-6” from bottom of 10” helix.

iii. Coupling hole pattern: The top of each lead pile shall have two (2) 1-5/16” holes through the pile as shown in Detail 2 of Sheet S-3 and Detail 1 of Sheet S-3.

• The first hole shall be centered 2.5” below the end of the pile.

• The second hole shall be centered 6.5” below the end of the pile and in line with the first hole.

5. Extension Piles: meet the dimensional and workmanship requirements of ASTM A500.

i. Must be provided with a welded coupling at the bottom of each extension.

ii. Coupling hole pattern: The top and bottom of each pile shall have two (2) 1- 5/16” holes through the pile. as shown in Detail 2 of Sheet S-3 and Detail 1 of Sheet S-3.

• The first hole shall be centered 2.5” below the end of the pile.

• The second hole shall be centered 6.5” below the end of the pile and in line with the first hole.

C. Helix Plates: Structural quality steel to conform ASTM A656 Gr 80 Type 7.

1. Strength: 80 ksi

2. Thickness: Minimum plate thickness of 1/2 inch.

3. Helix pitch: 3 inches

4. Helix diameter: 10 inches and 12 inches

5. Welding per AWS D1.1.

D. Coupling Bolts and Nuts

1. Bolts shall be 1-1/4” x 5-3/4” hex head per ASTM A449.

i. Able to resist an installation torque of 13,000ft-lbs

ii. Hot-dip zinc coating, ASTM A 153/A 153M, Class C.

2. Nuts: ASTM A563 Grade A Jamb Nuts

E. Pile Caps:

1. Pile caps shown in Detail B of Sheet S-1 Requirements of Pile Caps have been modified and new requirements are detailed below.

2. Shall be an adjustable circular plate 12” in diameter

3. Plate: ASTM A36

i. 3/4"x12” diameter plate with 3/4" Slotted holes in a circular configuration 9” in diameter for 5/8” diameter bolts

4. Pipe: ASTM A500, Grade 50.

5. Pile caps shall have one (1) 1-5/16” hole drilled through the pile cap pipe

i. The hole shall be drilled 6-1/2” below the top of the pile plate.

F. All helical pile sections, shafts, helix plates, pile caps and connectors shall be galvanized per ASTM A153, Class B, for corrosion resistance. The use of ASTM B633, Galvanized Electro Plating is prohibited.

G. Installation Tools (All helical piles/extentions must match current ROMO helical pile installation equipment as detailed below.)

1. Kelly Bar Adaptor with bent arm pin

i. 2-1/2” hexagonal Kelly bar, hole 2” from end of bar.

ii. Minimum torque: 13,000ft-lbs

iii. Flange with twelve (12) 13/16” holes on a 7-5/8” bolt circle. Minimum 5/8” thick T1 steel.

iv. Twelve (12) 3/4 inch Grade 5 bolts

2. Anchor Drive Tool

i. For use with a 3-1/2 inch outside diameter round shaft helical pier

ii. Coupling for a Kelly bar adapter with a 7-5/8-inch bolt circle, minimum 5/8” thick T1 steel.

iii. Two (2) 1.25” hardened pins located 2.5” below flange and 6.5” below flange, in line.

Delivery Locations: All materials will be delivered to the Rocky Mountain National Park Trails Shop at 863 Sundance Circle Drive, Estes Park, CO 80517.

Quantity:

The maximum that may be purchased under this order is:

Additional 20 - 5’ RS lead piles

Additional 40 – 7’ RS extension piles

Additional 10 - top plate caps

Additional 160 - coupling bolts and nuts

Delivery: Delivery should be made during regular operations periods and coordinated through the vendor and either the ESD Trails Supervisor (970) 586-1304 or Trails Program Supervisor (970) 586-1279.

Operations: All materials will be delivered to the Rocky Mountain National Park Trails Shop at 863 Sundance Circle Drive, Estes Park, CO 80517.

RMNP: 6:30am to 3:00pm MST, M-TH

No deliveries outside of regular operations or during federal holidays.