| 摘要 |
Process and system for increasing the load-bearing capacity of soil by producing load-bearing columns formed of densely compacted granular material, such as sand or gravel or of concrete. For producing each column, the granular material or concrete is fed down through a hollow member, and an air gun supported at the lower end of a pipe assembly extending down coaxially through the hollow member is actuated to produce powerful impulses to impel the soil outwardly away from the lower end of the hollow member to compact the soil and then to impel the granular material or concrete outwardly to distribute it into the resulting cavity formed in the compacted soil. When sufficient material has been distributed and compaced by the powerful impulses from the air gun, the hollow member and pipe assembly are withdrawn an increment of distance, and then the steps are repeated to distribute and compact more of the desired material at a level above the first deposit, and so forth, to create a column of such material. If desired to create an encased concrete column, the pipe assembly is withdrawn from the interior of the hollow member, which is then filled with concrete. To facilitate the initial insertion of the hollow member into the soil, water is jetted down through it while the air gun is actuated producing powerful impulses to impel the soil away from the lower end, and to compact the soil cylindrically about the descending member to enhance lateral support. A novel air gun energy source is adapted to be operated while embedded in soil, poured concrete, sand, grit, and similar hostile environments. Columns of more coarsely granular material can be produced in the soil to enable ground water to percolate up, the ground water being released by intense, repeated air gun impulses.
|
