Chance Drivecast™ Friction Pile for Deep Foundation Solutions
The CHANCE® Drivecast™ screw displacement pile utilizes soil displacement methodology which allows the pile to be advanced into the soil by rotation. Pile sections are comprised of a centralized steel shaft and a patented displacement assembly placed at regular intervals from the pile tip. By design, the pile establishes a cylindrical void which allows a column of grout to be immediately pulled down from a gravity-fed reservoir, creating a fully grouted, high capacity pile.
Permanent Foundations, Anywhere
Construct a high capacity pile, simply by installing the Drivecast™ pile to the required depth while maintaining a cement grout reservoir at ground surface. Gravity will naturally pull down the grout into the space provided by the displacement assembly, creating a fully encased grouted pile.
Benefits for Drivecast from Chance
- Efficient and predictable high capacity
- Lower mobilization costs
- Higher production than traditional auger cast piles
- Can be installed with smaller (non-specialized) equipment
- Minimal site disturbance
- Ideal for limited access/low overhead areas
- No vibrations or spoils
Friction Pile Application Versatility
Designed for projects where increasing capacity and providing predictable results is a must, the CHANCE Drivecast pile is fully grouted, resisting corrosion in aggressive soils and high water tables.
As a proven engineered system, bearing and side resistance is combined to bring a large diameter solution to a wide variety of applications for new construction, heavy highway, tanks/sewer, pipelines, and commercial/industrial buildings.
Perfect for limited access sites or areas with low overhead, this sectional, driven pile provides added capacity with efficient, predictable results.
Drivecast Pile Installation
Drivecast™ pile sections are engaged and advanced into the soil in a smooth, continuous manner at a rate of rotation of 5 to 20 RPM’s.
Extensions are installed for required depths can be achieved, while sufficiently applying down pressure to uniformly advance each of the sections. Sections are connected by using coupling bolts and nuts, torqued to 40 ft-lbs. The rate of rotation and magnitude of down pressure is adjusted for different soil conditions and depths.
The grout is released from a gravity-fed reservoir located at the surface, prior to the advancement of the lead section into the soil, and is continued until the minimum column length is achieved.
A rotary type, hydraulic power-driven torque motor should be utilized, along with a Kelly bar adapter and square shaft (SS) or round shaft (RS) drive tool. It is recommended that a torque indicator is used to measure torque and can be an integral part of the installation equipment or externally mounted in-line with the installation tooling.
Drivecast™ piles are offered both as uncoated or hot dip galvanized per ASTM A153 or A123. The fully grouted column itself provides one level of corrosion protection. If soil conditions, service life, or code requirements warrant additional protection, then hot dipped galvanization provides a second level of protection. Hot-dipped galvanization is the only practical means to provide a corrosion resistant coating capable of withstanding the rigors of installation.
|CENTRAL STEEL SHAFT (Lead Section)||a. Galvanization OR b. Minimum 1/8″ corrosion loss on outside||a. Bare steel OR b. Galvanization OR c. Minimum 1/8″ corrosion loss on outside||a. Galvanization OR b. Minimum 1/8″ corrosion loss on outside||a. Bare steel OR b. Galvanization OR c. Minimum 1/8″ corrosion loss on outside|
|CENTRAL STEEL SHAFT (Extension Displacement Section)||a. Galvanization AND Grout cover(3)||a. Bare steel OR b. Galvanization AND Grout cover(3)||a. Galvanization AND Grout cover(3)||a. Grout cover(3)|
|CENTRAL STEEL SHAFT (Extension Section)||a. Galvanization OR b. Epoxy coating AND Grout cover(3)||a. Bare steel OR b. Galvanization OR c. Epoxy coating AND Grout cover(3)||a. Galvanization OR b. Epoxy coating AND Grout cover||a. Grout cover(3)|
Lettered items are options.
For guidance on aggressiveness classification, see Table B of the Appendix.
1. Sustained tension or temporary tension (wind, seismic, impact) on life critical structural. For temporary tension on normal structures, corrosion protection under Compression is often used.
2. Corrosion protection shall extend 15′-0 below corrosive material.
3. Minimum 1″; in soil. If protective coatings (galvanization, epoxy) are provided in compression, minimum cover may be 0.25″ in soil.
Mechanical Strength Ratings
|TYPE SS175 1-3/4″ ROUND CORNER SHAFT||TYPE 22200 2″ ROUND CORNER SHAFT||TYPE RS3500 3-1/2″ O.D 0.300″ WALL PIPE||TYPE RS4500 4-1/2″ O.D 0.337″ WALL PIPE|
|Torsional Strength* Rating (ft-lb)||10,500||16,000||13,000||23,000|
|Grout Column Diameter (in)||8||12||10||12|
|Allowable Compressive Strength** (kip)||170||280||150||210|
*Actual installed capacities are dependent on soil conditions.
**CHANCE Drivecast™ allowable compressive strength = 0.33(fb)Ac + 0.4(Fys)As