Abstract
The self-Balaneed method is a new technology of foundation Pile static load test, vertical compression Pile is closer to the actual working conditions of a test method. It effectively compensates for the traditional test and solves difficult to resolve by the Pile foundation pile bearing capacity of questions: such as extra- heavy test piles,water test piles，Piles ramps, narrow slope and the venues test pile some problems， and the installation of a simple, operation convenience，off-site，time-saving effort，security, economic and other advantages in the country have begun to be widely used.
This article takes self-Balanced loading Pile test as a foundation， elaborated the development of our country pouring pile and the present convention static load testing methods. According to the actuai study state of the self-Balaneed loading pile test, the Principle, the equipment, the test ways and the buried technology of loading box for self-Balanced loading Pile test has been summed up. And carries on the design to the load box. Including to analysis of load box's structure, analysis of Specification, main dimension determination of Hydraulic cylinder, design of Structural and each unit assembling , seal and so on.
Finally，in the comprehensive summary paper work foundation，proposed that still waited for further thorough research some questions of this paper.
