CHANCE Products
Listed Below is a few of the applications of the CHANCE products:
Whether you are installing Vertically or Horizontally, CHANCE® Helical Piers are your solution for both Tension and Compression Loads.
Given this versatility, the applications of the CHANCE® Helical Pier System are Limitless!
Helical Pile
(New Construction)The CHANCE® helical pile is a segmented deep foundation system with helical bearing plates welded to a central shaft. Load is primarily transferred from the shaft to the soil through these bearing plates.
As a result of their true helical shape, the helices do not auger into the soil but rather screw into it with minimal disturbance. The first section, called the Lead (or Starter) Section, contains the helical plates. The Lead Section can consist of one to four helices.
If required, additional helices can be added with the use of Helical Extensions. Plain Extensions are then added until the Lead Section penetrates the bearing strata and the necessary or appropriate torque is achieved.
For New Construction applications, Helical Piles can be used as an alternative to traditional strip footings. After installation, the Helical Pile’s shaft can be cut to the desired elevation, fitted with the appropriate New Construction cap and cast in place with the concrete grade beam. This is extremely useful in locations with expansive soils, where traditional footings may not be possible.
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Underpinning
The CHANCE® helical pile is a segmented deep foundation system with helical bearing plates welded to a central shaft. Load is primarily transferred from the shaft to the soil through these bearing plates.
As a result of their true helical shape, the helices do not auger into the soil but rather screw into it with minimal disturbance. The first section, called the Lead (or Starter) Section, contains the helical plates. The Lead Section can consist of one to four helices.
If required, additional helices can be added with the use of Helical Extensions. Plain Extensions are then added until the Lead Section penetrates the bearing strata and the necessary or appropriate torque is achieved.
For New Construction applications, Helical Piles can be used as an alternative to traditional strip footings. After installation, the Helical Pile’s shaft can be cut to the desired elevation, fitted with the appropriate New Construction cap and cast in place with the concrete grade beam. This is extremely useful in locations with expansive soils, where traditional footings may not be possible.
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Helical PULLDOWN® Micropile
The Helical Pulldown® Micropile is a system for constructing a grout column around the shaft of a standard Helical Pier Foundation System Pile.
To begin the process, a screw anchor is placed into the soil by applying torque to the shaft. The helical shape of the bearing plates creates a tremendous pulling force that keeps the anchor advancing downward into the soil. After the lead section with the helical plates penetrates the soil, a Lead Displacement Plate and Extension are bolted onto the shaft. Resuming torque on the assembled shaft advances the helical plates and pulls the displacement plate downward, forcing soil outward to create a cylindrical void around the shaft. From a reservoir at the surface, a flowable grout immediately fills the void, surrounding and encapsulating the shaft. Additional extensions and displacement plates are added until the helical bearing plates reach competent load-bearing soil. This displacement pile system does not require removing spoils from the site.
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Helical Tieback Anchors
A pre-engineered tieback system for earth retention supplied by the largest manufacturer of anchors in the world simplifies the challenges for contractors. These tieback anchors are installed by rotating the anchors into the ground with common rotary drilling equipment.
Once the minimum depth is obtained the capacity can be determined by reading the installing torque and correlating it to the holding capacity ratio.
Capacities to 200,000 pounds per anchor are obtainable with this system. Proven on hundreds of applications these cost effective tiebacks can be tested immediately. No concrete to wait for curing! This saves time and money plus improves schedules.
The success of the screw anchor tieback system is based on decades of similar use of CHANCE anchors by electric utilities. The proven reliability and engineered predictability of the system’s performance give you tiebacks that are positive, economical and hassle-free.
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SOIL SCREW® Retention Wall System
Bearing plates are spaced along the entire length of screw anchors. These true-spiral helices install with ease and minimal soil disturbance. Monitoring torque during installation accurately indicates expected holding capacity for predictable results. Capacity is proportional to installation torque.
The SOIL SCREW® Retention Wall System reinforces in-situ soil with screw anchors near horizontal. Anchor sizes and grid spacing are determined by soil conditions and load requirements, including intended overburden.
The System removes performance uncertainties and associated costs of grouted nails in soils of low shear strength. Screw anchors in soil act as bearing devices as opposed to grouted anchors which rely on friction between the soil and grout.
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Shoring
CHANCE® helical piers can be used even under the heaviest loads to meet the Shoring demands of your project. The versatility of the CHANCE® helical pier, along with its quick and easy installation procedure make it the ideal choice for your projects shoring demands. Utilizing the increased column section of the Round Shaft, materials can be removed and the existing structure safely supported as excavation continues.
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Atlas Resistance Piers
Atlas Resistance Piers® have been used to restore and/or stabilize homes and commercial structures that have settled due to a wide variety of soil problems. Foundation settlement and movement can be caused by building on expansive clay, compressible or improperly compacted fill soils, or improper maintenance around foundations. Whatever the cause, settlement can destroy the value of structures and render them unsafe.
Properly installed, Atlas Resistance Piers can prevent settlement, stabilize foundations and restore settled structures nearly to their original positions, often closing structural defects such as cracks and deformities caused by settlement. Because the solution is both permanent and economically attractive, the structures retain or recover their value.
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INSTANT FOUNDATION® SYSTEM
CHANCE® Civil Construction manufactures the Instant Foundation® System to provide resistance to lateral loads and moment loads due to wind and other load conditions. The versatility and ease of construction of the Chance® Instant Foundation® System permits great flexibility in a number of applications. Typical uses for these products are foundations for equipment pads, foundation supports for signs, supports for light standards and decorative poles, and other eccentric load applications.
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Boardwalks
CHANCE® helical screw anchors can be used as instant foundation systems for boardwalks. These are typically connected to the walkway using a CHANCE® U-shaped bracket, which sleeves over or into the anchor shaft depending upon the anchor selected.
The piers are also a perfect solution for an environmentally sensitive area which typical construction traffic is prohibited. Minimal disturbance is achieved by using a hand-held torque head, or by a machine that sits on top of the walkway.
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Telecom/Utility
Application for guyed structures, self-supporting towers, structures substations, and switching stations are all part of the CHANCE® T/C (tension-compression) foundation and guy anchor product line. Applications in sensitive areas, high water tables, difficult access as well as normal soils make the CHANCE T/C foundation a priority in transmission line construction.
The CHANCE® guy anchor, Type SS, proprietary high strength steel can have capacities to 200,000 pounds tensile load. These anchors have been field proven over decades of service under the severest conditions.
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Solar/Energy
Helical piles work well in both compression and tension, they are ideally suited for conditions inherent to energy-related construction sites, particularly those associated with solar projects. The piles resist the axial forces, shear, and moment forces generally associated with wind loading.
Another advantage of using helical piles is the lack of spoils from contaminated soils and the ability to avoid grading and other ground disturbances. As developers of alternative energy projects will attest, it is important to maintain the sites as naturally as possible.
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Mooring Anchors
Mooring fields for municipal and private harbors are a cost-effective way to safely store your boats.
CHANCE® Helical Anchors can offer a simple, economical mooring for boats requiring holding capacities to 100,000 pounds or even more. These moorings are so effective that in areas subject to hurricanes, special incentives are often offered by insurance companies to boat owners who use these moorings.
CHANCE® Screw Anchors are installed into the harbor bottom by either work boats or divers using hydraulic rotary installing equipment with anti-torque devices. The bearing plates are installed through the silt to good bearing soils and the chains or lines are connected to the mooring or platforms above. The same anchors are used in the fast-growing aqua-culture field holding fish cages securely to the ocean bottoms.
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Pipelines
Pipeline Screw Anchors provide an excellent answer for stabilization of oil, gas, and other pipelines utilizing CHANCE Products. Buoyancy of pipelines is a major concern in the design and construction of all pipelines. In water or mud, an empty pipeline with diameter greater than 12 inches can push itself to the surface if it has not been anchored. Economics and engineering evaluations show that screw anchors are the predictable, measurable, and economical means for pipeline stabilization.
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Displacement Piles
The GroutForce™ displacement pile (GDP) is a patented foundation solution for loose to dense sand or soft to firm clay and can provide significant axial and lateral load capacities. Since the grout column increases diameter and frictional bond, the shaft length may be reduced by 50% or more versus other pile types while maintaining its high ultimate compression capacity.
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Tilt-Up Panels
Since helical anchors support loads in both tension and compression applications, they are perfect for tilt-up walls, which are subject to wind load trying to push or pull the wall.
Office buildings, warehouses, and other large buildings are on a fast-paced construction schedule, and prefabricated perimeter walls increase efficiency and save time at the job site. By using tilt-up panel construction, the contractor has the advantage of being able to complete site preparation and footings while the wall panels are being made.
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