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1. A jackable foundation for a building comprising:
a rectangular steel foundation support platform, having four corners, and having a lower surface and an upper surface on which the building rests; four cuboidal column guides, wherein each cuboidal column guide is attached to one of the corners of the foundation support platform, and wherein each cuboidal column guide comprises two rectangularly interconnected square roller frames, consisting of a first tier roller frame, which is horizontally aligned with the foundation support platform, and a second tier roller frame, which is at a level above a level of the foundation support platform, and wherein each roller frame contains a pair of opposing roller mechanisms, each roller mechanism comprising a cylindrical roller, which is horizontally rotatably supported through an axial bore by a roller rod attached to the respective roller frame; four vertical flanged column beams, located at the four corners of the foundation support platform, each column beam having an upper and a lower terminus, with the lower terminus secured below an underlying grade elevation, and each column beam having two opposing faces disposed between two end flanges, wherein the paired roller mechanisms of each roller frame slidably engage the two opposing faces of one of the column beams, such that the foundation support platform has a slidable range of movement upward and downward along the column beams, and wherein the upward range of movement is constrained by four column caps located at the upper terminus of each column beam, and wherein the downward range of movement is constrained by four frame stop blocks laterally extending from each column beam at a non-raised platform elevation; one or more scissor jacks attached to the foundation platform, or attached to one or more of the cuboidal column guides, or attached to both the foundation support platform and to one or more of the cuboidal column guides, such that the one or more scissor jacks, when activated, cause the foundation support platform to slide upward along the column beams to a raised platform elevation, and such that the scissor jacks lift and support the building and the foundation support platform at the raised platform elevation; and wherein the first tier roller frame and the second tier roller frame of each cuboidal column guide are rigidly interconnected at four corners by vertical members, so as to form the cuboidal column guides as open cuboidal structures, and such that the vertical members resist any torque that tends to rotate the roller frames out of the horizontal plane or that tends to deform the cuboidal structures of the cuboidal column guides, thereby reducing the likelihood of jamming of the roller frames on the column beams. |
