| 摘要 |
<p>A stepped pile unit for use in soil having a seasonally frozen region and a permanently frozen region, comprising at least one pile body having an upper end located in said seasonally frozen region and extending above the ground and a lower end extending into said permanently frozen region, elongated sleeve means encircling at least part of said upper end and extending downwardly along said lower end into said permanently frozen region, and means for structurally interconnecting the sleeve means and pile body and spacing said sleeve means radially outwardly of said pile body to increase the effective diameter of the pile body down into the permanently frozen region.</p> |
