Assembled steel soldier pile for earth-retaining walls

Assembled steel soldier pile with an open cross-section formed by connecting a C-shaped inner member and a convex outer member with lattice members

This technology is an assembled steel soldier pile for earth-retaining walls, inserted into drilled holes. It features a C-shaped inner member facing the excavation side, a convex plate-type outer member facing the rear, and lattice members connecting both sides to create an open cross-section.

Conventional H-piles have symmetric cross-sections, making them inefficient at supporting horizontal earth pressure acting from one direction. Additionally, their flanges and webs divide the drilled hole like a partition, complicating the insertion of tremie pipes and often leading to material segregation and poor concrete filling. Previous assembled steel piles also suffered from closed cross-sections, preventing the integration of concrete inside and outside the pile and hindering structural integrity.

This technology uses an arched, triangular, or trapezoidal convex outer member to maximize the moment of inertia within the drilled hole, reducing torsion, deflection, and lateral buckling during installation. Lattice members are arranged in parallel or inward-tapering diagonal patterns, with bent joints attached to the support and outer member. The inner member can be thickened, or longitudinal reinforcements added to the outer member. Suitable for CIP earth-retaining walls on bedrock, deep urban excavations, and temporary structures for parking lots or subway stations, the open cross-section allows concrete to flow freely, ensuring the pile and surrounding concrete act as a single unit against earth pressure.

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Key Features:

• An inner member consisting of a plate-shaped inner flange, inner webs bent at right angles toward the rear on both sides, and supports extending inward from the web ends.
• An outer member with a width-wise center section formed into a convex arch, triangle, or trapezoid, spaced at a set distance from the inner member.
• Lattice members made of bent wire in a repeating pattern, joined to both width-wise sides of the outer and inner members.
• A pair of lattice members arranged diagonally, tapering in width from the end joined to the outer member toward the inner member.

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