| CPC E21D 11/105 (2013.01) [E21D 11/102 (2013.01); E03B 3/02 (2013.01)] | 20 Claims |

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13. A method for forming an elongated concrete structure, the method comprising:
positioning a sled in an initial position on a ground surface upon which the elongated concrete arch is to be formed, the sled having a central passage formed as a tunnel extending beneath the sled;
positioning a first form on the ground surface adjacent to an entrance to the central passage of the sled;
advancing the sled forward to a first position wherein the first form is positioned beneath the sled;
forming the first form into a desired shape, wherein forming the first form occurs as a result of advancing the sled forward to the first position;
filling space between the first form and the sled with concrete to form a first section of the elongated concrete structure positioned on the ground surface;
positioning a second form on the ground surface adjacent to the entrance to the central passage of the sled, wherein the second form is aligned with and adjacent to the first form;
advancing the sled forward to a second position wherein the second form is positioned beneath the sled; and
filling space between the second form and the sled with concrete to form a second section of the elongated concrete structure positioned on the ground surface aligned with and in direct contact with the first section.
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