Method and installation for the subterranean support of underground conduits
In one exemplary embodiment, curved sheet pile is driven underneath an existing conduit using a pile driver guided hydraulically by an excavator or other heavy machinery. By vibrating the curved sheet piles, the soil is placed in suspension, which allows the piles to be directed through the soil along an arcuate path that has a curvature that substantially matches the radius of curvature of the piles. Once the pile is positioned as desired, each individual pile sheet can be welded to one another to form a unitary structure. In one exemplary embodiment, the curved sheet pile is inserted beneath a conduit using a vibratory pile driver that rotates about a fixed pivot element on an excavator or other heavy machine for positioning the pile driver to advance the curved sheet pile along a fixed arc.
1. A method of supporting a conduit buried in subterranean material, comprising:
positioning a leading edge of a first section of arcuate sheet pile relative to a buried conduit such that the edge is aligned with subterranean material underneath the conduit; and
advancing the curved sheet pile along an arcuate path through the subterranean material beneath the conduit to a position in which the sheet pile is disposed beneath the conduit and separated therefrom by a layer of the subterranean material.
2. The method of claim 1 , wherein the curved sheet pile is advanced along the arcuate path by means of a vibratory pile driver that engages the sheet pile.
3. The method of claim 2 , wherein the pile driver engages a trailing edge of the sheet pile.
4. The method of claim 1 , wherein the curved sheet pile is advanced along the arcuate path by means of a hydraulically generated pushing force.
5. The method of claim 1 , and including the step of advancing a second section of arcuate sheet pile along an arcuate path through the subterranean material adjacent the first section of sheet pile.
6. The method of claim 5 , including the step of interlocking the sections of sheet pile together along adjacent side edges thereof.
7. The method of claim 6 , wherein the step of advancing the second section through the subterranean material causes the sections of sheet pile to interlock.
8. The method of claim 5 , further comprising the steps of positioning a beam to extend above the conduit, connecting the first section of curved sheet pile to the beam, and connecting the second section of curved sheet pile to the beam to thereby support the sections of sheet pile.
9. The method of claim 1 , further comprising the steps of positioning a beam to extend above the conduit, and connecting the first section of curved sheet pile to the beam to thereby support the section of sheet pile.
10. The method of claim 9 , and then installing or repairing a conduit beneath the first section of sheet pile.
11. The method of claim 1 , and then excavating subterranean material beneath the sheet pile.
12. An installation for supporting a conduit buried in subterranean material, comprising:
a first section of arcuate sheet pile disposed beneath the buried conduit and spaced from the buried conduit by a layer of the subterranean material, the sheet pile having a concave surface facing the conduit;
the sheet pile being suspended from above to thereby support the conduit and the layer of subterranean material whereby subterranean material beneath the sheet pile can be excavated.
13. The installation of claim 12 , wherein subterranean material beneath the sheet pile has been removed.
14. The installation of claim 12 , including a support structure supported on the surface of the ground and including connection elements extending downwardly adjacent the buried conduit that engage the sheet pile to thereby suspend the sheet pile.
15. The installation of claim 12 , including a plurality of arcuate sheet piles disposed beneath the buried conduit in side-by-side relationship along a length of the conduit each having their concave surfaces facing the contour.
16. The installation of claim 15 , wherein the sheet piles are interlocked with each other along adjacent side edges of the sheet piles.