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2. Timber Pile Foundation

In applications through a wetland, over water, or with shifty soil conditions, timber piles may be the most cost-effective foundation option. Our PermaTrak system is easily installed on a timber pile foundation as is common with timber or composite boardwalk construction. Once a pile is driven to the specified depth a "cap" is secured to each pile with a lag bolt, setting the template for the rest of the boardwalk construction process.

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1. The PermaTrak system is manufactured by local precasters throughout the country. We own and maintain these steel production forms to ensure consistent quality control.

abutment on mud mat

2. The boardwalk's beginning and ending stations typically utilize our precast abutment piece, on a bed of granular stone or an unreinforced concrete "mud mat." Lift inserts allow for easy handling.

timber piles

3. Timber piles are typically installed with 10' longitudinal spacing. Often a 12'' or 14'' diameter pile is desired for quick and easy installation.  

cap alignment

4. Caps are placed on each timber pile by hand. They are aligned and measured for correct spacing per the installation drawings.  A lag bolt is drilled through the center precast hole down into the pile for a secure connection. 

grout filled cap

5. "Cap" components transfer the load from the precast beams to the timber piles. A non-shrink grout fills the pile-cap connection for long-term durability. The dimples on the top of the caps accept spherical polyurethane pins.

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6. Polyurethane "mushroom" pins connect the precast beams to the foundation elements. "Barrel" pins eliminate lateral movement while "H-Connectors" secure the boardwalk for floodplains/storm surge areas.

spherical pin into bottom of beam

7. Spherical mushroom-shaped pins fit into formed slots in the bottom of the beams. 

beams on abutment

8. A 1/8'' rubber bearing pad strip is laid on the beams to eliminate any uneven bearing. Shown here in the top of the beam is an H-connector insert for a tie down connection in storm surge/floodplain areas. 

  

beams on piles

9. Precast beams span from pile cap to pile cap, no stringers every 16'' necessary. Treads span across the beams laterally.

 

slings tread

10. Precast treads are easily maneuvered into place with small construction equipment such as a Bobcat with slings. Smaller treads can easily be placed into position by hand. 

gap spacing

11. Tread installation continues while consistent 1/8'' joint spacing and boardwalk alignment is periodically checked for accuracy. 

 

tapered treads

12. Curved alignments are formed by use of tapered tread pieces.  

 

steel curb 

13. Steel curbs are a nice option for a low-lying boardwalk. We are able to work with a variety of bolt patterns to provide a clean, finished look.

 concrete curb

14. Concrete curbs are also popular choices as an add-on feature. Connecting hardware is hidden from view and curbs attach without any field drilling.

 timber post bracket

15. PermaTrak's steel brackets can be manufactured with a powder-coating, galvanized, or stainless steel finish. A 4'' x 4'' post upright fits into the bracket to allow for a variety of timber railing designs. Bolts are threaded through the boardwalk's tread gaps and connect to a bottom plate on the underside of the walking surface.

timber railing 

16. Railing options with the PermaTrak boardwalk system span a wide range. The least expensive material is typically a variation of timber: Cedar, Southern Yellow Pine, Redwood, etc.

 aluminum railing

17. Aluminum railings can also be supplied as part of a completely seamless, engineered and manufactured boardwalk system.

 steel railing

18. A custom, stainless steel railing is one of the more expensive options to complete a boardwalk project. Railing options are limited only by the creativity of the designer and end user. Although a one-sided railing may fall into the "overly-creative" category!

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