Case study of spiral pile foundation for thecorridor bridge in the wetland park-By application category

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Case study of spiral pile foundation for thecorridor bridge in the wetland park

Foundation for the Ecological Boardwalk and Gallery Bridge of Lishui Jiulong Wetland Park

intro

Overall summary of the project

Wetland park, ecological boardwalk and covered bridge projects impose stringent environmental protection requirements on foundation construction. The foundation system must not only support the superstructure of walkways or covered bridges, but also minimize damage to vegetation, water bodies, soft ground and the overall landscape environment. This case is highly suitable to be featured as a representative case of "Eco-Friendly Foundation Solutions" for new project sites.

Project Background

The core contradiction of wetland projects lies in the following: superstructures require long-term stable support, while construction activities must minimize environmental disturbance. Conventional concrete foundations typically involve excavation, formwork installation, concrete transportation and curing, which tend to disturb water bodies, vegetation and soft ground surfaces.

Project Challenge

The shallow soil in wetlands features high water content, resulting in low bearing capacity and poor construction stability.

Ecologically sensitive areas are not suitable for large-scale excavation and extensive concrete wet works.

Access for construction equipment is restricted, leading to high site restoration costs.

Long-term control of settlement and structural vibration is required for covered bridges and boardwalk structures.

Engineering Theoretical Explanation

Screw piles are highly suitable for the foundations of lightweight structures such as wetlands boardwalks and covered bridges. Their screw-in installation method cuts earth excavation; the helical flights penetrate weak shallow soil layers and transfer loads to more stable deep soil strata.

From a mechanical perspective, the foundations of boardwalks and covered bridges mainly bear pedestrian live loads, self-weight, local horizontal forces and environmental loads. Screw piles deliver vertical support and lateral restraint via the pile shaft, while the flights provide end bearing capacity and uplift resistance. For soft soil conditions, properly specified pile length and flight diameter are particularly critical for settlement control.

From an environmental perspective, screw piles eliminate concrete pouring, spoil haulage and the risk of cement contamination on site, better meeting the low-disturbance construction requirements of wetland, park and ecological corridor projects.

SSP supplies round tubular screw pile foundations for lightweight facilities including park corridors, landscape walkways, viewing decks, timber platforms and urban public spaces. The pile top connections are compatible with timber beams, steel beams and prefabricated platform structures.

For municipal landscape scenarios such as urban parks, greenway corridors, scenic footpaths, leisure boardwalks and elevated viewing platforms, conventional concrete foundations have obvious pain points: massive excavation, vegetation damage, long construction cycles, complicated pavement restoration and severe ecological impacts. This solution adopts hot-dip galvanized prefabricated screw pile foundations to replace traditional cast-in-place concrete foundations. It adapts to complex ground conditions including soft soil, backfill and shallow topsoil in green spaces, realizing zero large-scale excavation, zero vegetation damage, ultra-fast construction and instant finished effect upon completion. It serves as the optimal foundation solution for lightweight, eco-friendly and rapid construction of urban landscape projects.

Project Value

Minimize disturbance to wetland vegetation and water bodies.

Applicable to sites with soft soil and high moisture content.

Flexible construction equipment, suitable for confined spaces in scenic areas and parks.

Help build SSP’s brand image as a provider of eco-friendly foundation solutions.