Injection tube countersinking
Methods, and apparatuses used in those methods, of countersinking injection tubing below the surface of a structure, such as pavement, so that injection tubing will not extend above the surface of the structure even after movement of the soil, for example, due to frost heave or shrink-swell. Some embodiments employ an injection tube extension and/or an injection tube advancer to countersink the injection tubing within the soil beneath a structure.
1. A method for increasing the bearing capacity of soil comprising:
placing an injection tube into soil beneath a structure, the structure having a surface, and the injection tube having a first end, a second end spaced apart from the first end, and a length extending between the first end and the second end of the injection tube, where the length of the injection tube is shorter than a distance from the surface to a desired depth for injecting material into the soil;
coupling a first end of an injection tube extension to the second end of the injection tube, the injection tube extension having a second end spaced apart from the first end of the injection tube extension, and a length extending between the first end and the second end of the injection tube extension;
coupling a first end of an injection tube advancer to the second end of the injection tube extension, the injection tube advancer having a second end spaced apart from the first end of the injection tube advancer, where the injection tube advancer is configured to be coupled to a tool capable of advancing the injection tube into the soil;
coupling the second end of the injection tube advancer to a hammer drill;
advancing the injection tube and the injection tube extension into the soil until the first end of the injection tube is at the desired depth;
injecting material through the injection tube when the first end of the injection tube is at the desired depth, where the second end of the injection tube is entirely below the surface when the first end of the injection tube is at the desired depth; and
after injecting material through the injection tube at the desired depth, removing the injection tube extension from the soil.
2. The method of claim 1 , further comprising removing the injection tube advancer from the injection tube extension prior to injecting material through the injection tube.
3. A system for advancing an injection tube into soil comprising:
an injection tube have a first end, a second end spaced apart from the first end, a length extending between the first end and the second end of the injection tube, and an injection tube lumen extending the length of the injection tube, where the injection tube is configured to be positioned in soil such that the second end of the injection tube is below a surface of a structure positioned on the soil when the first end of the injection tube is at a desired depth for injecting material into the soil;
an injection tube extension having a first end, a second end spaced apart from the first end of the injection tube extension, a length extending between the first end and the second end of the injection tube extension, and an injection tube extension lumen extending the length of the injection tube extension, the first end of the injection tube extension configured to be coupled to the second end of the injection tube such that the injection tube extension lumen is in fluid communication with the injection tube lumen, where the injection tube extension is configured such that at least a portion of the injection tube extension extends above the surface when the first end of the injection tube is at the desired depth; and
an injection tube advancer having a first end, and a second end spaced apart from the first end of the injection tube advancer, where the first end of the injection tube advancer is configured to be coupled to the second end of the injection tube extension, where the second end of the injection tube advancer is configured to be coupled to a tool for advancing the injection tube into soil, and where the tool is a hammer drill.
4. A method for increasing the bearing capacity of soil comprising:
placing an injection tube into soil beneath a structure, the injection tube having a first end and a second end spaced apart from the first end;
coupling a first end of an injection tube extension to the second end of the injection tube, the injection tube extension have a second end spaced apart from the first end of the injection tube extension;
coupling an injection tube advancer to the second end of the injection tube extension, the injection tube advancer configured to be coupled to a tool capable of advancing the injection tube into the soil;
advancing the injection tube into the soil and the injection tube extension at least partially into the soil until the first end of the injection tube is at a desired injection depth in the soil;
removing the injection tube advancer from the second end of the injection tube extension;
injecting expansive material through the injection tube and injection tube extension when the first end of the injection tube is at the desired depth;
removing the injection tube extension from the second end of the injection tube; and
filling the space in the soil created by removing the injection tube extension with filler material.
5. The method of claim 4 , further comprising stopping injection of material into the soil, and removing the injection tube extension from the soil within one minute of the stopping.