| 摘要 |
Apparatus and methods for multi-piece tubing are disclosed. Optional nestable embodiments (12, 14, 16, and 18) provide benefits in storage, transportation, and use. Optional interlocking elements (30, 32) provide benefits in ease of assembly and use, and possible disassembly, including with other tubing or non-tubing elements such as a base (20). End cover elements (19) can protect tube's interior from undesired dirt, liquid, or other contaminants, and can be removable. Methods include use in forming concrete pier footings or other building supports. |
