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Overview of the Technology

Theoretical Background ▼

Overview of HRW

  • The helix is designed to be inserted into the soil by rotating in a clockwise direction.
  • Since it follows a screw-type insertion, soil disturbance from the helix blades is minimal.
  • Installed to the design depth through the connection of extension rods (couplers).
  • The retaining wall connected to the helix resists earth pressure, reducing active displacement and increasing the stability of the retaining wall.

HRW Stress Distribution

Components of the Technology ▼

Installation Plan View

Installation Sectional View

※ The above configuration may vary depending on site conditions.

Field Applicability Test ▼

Helix Pullout Resistance Test

  • Testing is conducted to confirm and verify the field applicability and constructability of the freestanding retaining method using helix, ensuring design pullout force and helix blade design technology considering ground irregularities.

Test Equipment

Test Equipment List
Equipment Name Capacity Quantity Remarks Special Notes
Jack, Pump 250Ton 1set Hydraulic -
Road Cell 500Ton 1ea - Verification of Inspection and Calibration Certificate
Load-Bearing Platform 150Ton 1set H-pile H-300×300×11×18
Reference Beam 5.0m 2ea Steel 100×100
Digital Gauge 50.0mm 2ea Anout 1/100mm Verification of Inspection and Calibration Certificate
Magnetic Holder - 2ea Magnetic Type -
Other Auxiliary Equipment - 1set Stopwatch, data Steel , etc. -

Displacement under Load for Penetration Depth (3.0m / Helix 1,3ea)

하중에 따른 변위량
Teat-1 [No.1] Teat-2 [No.2]
하중에 따른 변위량
Category Test Location Pile Type(mm) Penetration Depth(m) Number of Helices(ea) Test Date Type
Test-1 No.1 ø114.1(gt) 3.0 1ea 2023.06.01 HELICAL PILE
Test-2 No.2 ø114.1(gt) 3.0 3ea 2023.06.01 HELICAL PILE
Sectional View
Sectional View
Teat-1 [No.1] Teat-2 [No.2]

Displacement under Load for Penetration Depth (6.0m / Helix, 3ea, 6ea)

하중에 따른 변위량
Teat-3 [No.3] Teat-4 [No.4]
하중에 따른 변위량
Category Test Location Pile Type(mm) Penetration Depth(m) Number of Helices(ea) Test Date Type
Test-3 No.3 ø114.1(gt) 3.0 3ea 2023.06.01 HELICAL PILE
Test-4 No.4 ø114.1(gt) 3.0 6ea 2023.06.01 HELICAL PILE
Sectional View
Sectional View
Teat-3 [No.3] Teat-4 [No.4]
하중에 따른 변위량
Category Test Location Maximum Applied Load(kN/ea) Pullout Amount(mm) Residual Settlement(mm)
Test-1 No.1 49.05 38.41 -
Test-2 No.2 65.67 46.75 43.94
Test-3 No.3 127.53 31.39 -
Test-4 No.4 264.57 57.89 55.97

※ "It has been shown that the number of helices and the cross-sectional areaat the same penetration depth affect the pullout resistance.

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