Photovoltaic power generation support pile tension test

What are the different types of photovoltaic support foundations?

The common forms of photovoltaic support foundations include concrete independent foundations, concrete strip foundations, concrete cast-in-place piles, prestressed high-strength concrete (PHC piles), steel piles and steel pipe screw piles. The first three are cast-in situ piles, and the last three are precast piles.

Can photovoltaic support steel pipe screw piles survive frost jacking?

To study the frost jacking performance of photovoltaic support steel pipe screw pile foundations in seasonally frozen soil areas at high latitudes and low altitudes and prevent excessive frost jacking displacement, this study determines the best geometric parameters of screw piles through in situ tests and simulation methods.

Why is ground screw steel pile used for PV mounting structure?

Ground screw steel pile (helical pile) was applied for foundation because the convenient of installation and fasten with PV mounting frame. The ground screw load test was performed to prove the axial pile capacity for the advantage of engineering design for PV mounting structure.

How much load can a ground screw pile support?

From the test results reveal that the ground screw pile capacity can support and maintain the compression and pull-out load between 1,000 to 2,000 kg depend on the pile length and subsoil condition in each location. The displacements of pile in load direction were observed which less than 15% of ground screw diameter. 1. Introduction

What is the standard test method for pile compression & pull-out testing?

The pile compression testing was followed ASTM D 1143-81 “Standard Test Method for Piles Under Static Axial Compression Load” while pull-out testing followed D 3689-90 “Standard Test Method for Individual Piles Under Static Axial Tensile Load”.

How to measure the deformation and stress state of PHC piles?

However, due to the fact that the foundation part of PHC piles was buried in the soil, it was challenging to obtain the deformation and stress state through monitoring means. There was no direct test method available for measuring the deformation of short pile foundations beneath the ground.