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ABC Diving

SEAWORKS (Vanuatu), Main Street, Nambatu, P.O. Box 3242 Port Vila – Phone +678 7100 230 (WhatsApp)

SEAWORKS (New Caledonia), BP 7036 – 98801 Noumea Cedex – Phone +687 87 55 05

We operate throughout Oceania Islands, with the capacity to stay working at remote locations

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HELICAL ANCHORS (or Helix Anchors, or Screw Anchors)

UNDER WATER BLANKING & COFFERDAM

What is a helical anchors?

A helical anchor/pile consists of one or more helix-shaped bearing plates attached to a central shaft, which is installed by rotating or "torqueing" into the ground. Each helix is attached near the tip, is generally circular in plan, and formed into a helix with a defined pitch. Helical anchors/piles derive their load-carrying capacity through both end bearing on the helix plates and skin friction on the shaft.

Helix Anchors Description

Lead Section

Above: Round Shaft (RS)
below: Square Shaft (SS)

The Round Shaft “RS” (or Round-Rod “RR”) multi-helix anchors are used in areas where weak soil conditions exist and moderate holding capacities are required. All helix lead sections are 7 ft. long. Extension shafts may be required for installation to proper depth. The Square-Shaft “SS” multi-helix screw anchors are designed for heavy-guy loading. They have 1-1⁄2″ square steel shafts. RS and SS screw anchors consist of three galvanized components: the lead section, the extension shaft and the guy adapter.

Extensions

Plain extensions , either square or round, are added in standard lengths of 3, 5, 7 and 10 feet until the lead section penetrates into the bearing strata.
Typically, square shaft extensions can be used in both compression and tension applications. Round shafts are more commonly used for compression and have a greater section modulus, resisting bending in weaker soils.

Guy Adpaters

Thimbleye & Ovaleye
without Pulling Eye

Twineye & Tripleye
with Pulling Eye

Which use for Helical Anchors – Piles?

  • Anchoring for boats, floating docks, bulkheads, seawalls, fixed pier, etc.
  • Pipelines Stabilization (fresh water, oil, gas, sewage, etc.)
  • Piled Walways construction (combination anchors type "SS/RS" series)
  • Instant Foundation for bollard walkay lighting
  • Helical Screw Piles for new construction - Slabs and Foundations
  • Foundation Underpinning
  • Earth Retention Shoring System

Which use for Helical Anchors – Piles?

  • Quick, easy turnkey installation
  • Immediate loading
  • Small installation equipment
  • Pre-engineered system
  • Easily field modified
  • Torque-to capacity correlation
  • Install in any weather
  • Solution for:
  • Restricted access sites
  • High water table
  • Weak surfaces soils
  • Environmentally friendly
  • No vibration
  • No spoils to remove
  • No concrete.

Anchor Drive

The anchor installation requires a hydraulic Driver .
ABC Diving/SEAWORKS operate PENGO Driver RS-6 up to 6750 ft/lb actual torque (9,287 NM).

Round Shaft anchors torque rating is 2,300 ft/lb (3,164 NM). Ultimate tension rating for RS mechanical strength is 70,000 lb.
Square Shaft anchors Max. Installation Torque is 5,500 ft/lb (5,767 NM). Minimum Ultimate tension strength is 70,000 lb.

The hydraulic Driver is operated off a small barge (draft 0.40 m, length 14 m, width 6 m, lightship 5 ton, deadweight 10 ton).

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